Add product agnostic package installation templates for currently supported OSs

Amazon-Linux.md

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+# Installing {{ product }} on Amazon Linux
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+!!! info
+
+    A paid repository subscription is required for Amazon Linux 2 repositories. Get more information on
+    [icinga.com/subscription](https://icinga.com/subscription).
+    
+    Don't forget to fill in the username and password section with appropriate credentials in the local .repo file.
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+wget https://packages.icinga.com/subscription/amazon/ICINGA-release.repo -O /etc/yum.repos.d/ICINGA-release.repo
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+yum install {{ package }}
+```

CentOS.md

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+# Installing {{ product }} on CentOS
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+wget https://packages.icinga.com/centos/ICINGA-release.repo -O /etc/yum.repos.d/ICINGA-release.repo
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+yum install {{ package }}
+```

Debian.md

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+# Installing {{ product }} on Debian
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+Here’s how to add the official release repository:
+
+```bash
+apt-get update
+apt-get -y install apt-transport-https wget gnupg
+
+wget -O - https://packages.icinga.com/icinga.key | apt-key add -
+
+DIST=$(awk -F"[)(]+" '/VERSION=/ {print $2}' /etc/os-release); \
+ echo "deb https://packages.icinga.com/debian icinga-${DIST} main" > \
+ /etc/apt/sources.list.d/${DIST}-icinga.list
+ echo "deb-src https://packages.icinga.com/debian icinga-${DIST} main" >> \
+ /etc/apt/sources.list.d/${DIST}-icinga.list
+
+apt-get update
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+apt-get install {{ package }}
+```

Fedora.md

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+# Installing {{ product }} on Fedora
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+dnf config-manager --add-repo https://packages.icinga.com/fedora/$(. /etc/os-release; echo "$VERSION_ID")/release
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+dnf install {{ package }}
+```

RHEL.md

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+# Installing {{ product }} on RHEL
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+!!! info
+
+    A paid repository subscription is required for Amazon Linux 2 repositories. Get more information on
+    [icinga.com/subscription](https://icinga.com/subscription).
+    
+    Don't forget to fill in the username and password section with appropriate credentials in the local .repo file.
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+wget https://packages.icinga.com/subscription/rhel/ICINGA-release.repo -O /etc/yum.repos.d/ICINGA-release.repo
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+=== RHEL 8 or later
+
+    ```bash
+    dnf install {{ package }}
+    ```
+
+=== RHEL 7
+
+    ```bash
+    yum install {{ package }}
+    ```

SLES.md

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+# Installing {{ product }} on SLES
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+!!! info
+
+    A paid repository subscription is required for Amazon Linux 2 repositories. Get more information on
+    [icinga.com/subscription](https://icinga.com/subscription).
+    
+    `zypper` automatically prompts you to enter your username and password for the subscription.
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+
+zypper ar -r https://packages.icinga.com/subscription/sles/$releasever/release/ icinga-stable-release
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+zypper install {{ package }}
+```

Ubuntu.md

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+# Installing {{ product }} on Ubuntu
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+Here’s how to add the official release repository:
+
+```bash
+apt-get update
+apt-get -y install apt-transport-https wget gnupg
+
+wget -O - https://packages.icinga.com/icinga.key | apt-key add -
+
+. /etc/os-release; if [ ! -z ${UBUNTU_CODENAME+x} ]; then DIST="${UBUNTU_CODENAME}"; else DIST="$(lsb_release -c| awk '{print $2}')"; fi; \
+ echo "deb https://packages.icinga.com/ubuntu icinga-${DIST} main" > \
+ /etc/apt/sources.list.d/${DIST}-icinga.list
+ echo "deb-src https://packages.icinga.com/ubuntu icinga-${DIST} main" >> \
+ /etc/apt/sources.list.d/${DIST}-icinga.list
+
+apt-get update
+```

openSUSE.md

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+# Installing {{ product }} on openSUSE
+
+The recommended way to install {{ product }} is to use prebuilt packages from our official release repository.
+If the repository is not configured yet,
+please [add](#adding-icinga-package-repository) it first
+before [installing](#installing-the-package) the package.
+
+All packages we provide are signed with the following [key](https://packages.icinga.com/icinga.key).
+
+## Adding Icinga Package Repository
+
+Here’s how to add the official release repository:
+
+```bash
+rpm --import https://packages.icinga.com/icinga.key
+zypper ar -r https://packages.icinga.com/openSUSE/ICINGA-release.repo
+```
+
+## Installing the Package
+
+Use your distribution's package manager to install the `{{ package }}` package as follows:
+
+```bash
+zypper install {{ package }}
+```