Created Installation (markdown)

Installation.md

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+Follow the Installation instructions in README.md. Then for MySQL support:
+
+```bash
+sudo apt-get install mysql-server
+mysql_secure_installation
+```
+
+Create a DB in MySQL and apply the SQL script inside the xo-server/config folder
+
+```bash
+mysql -u root -p
+```
+
+```sql
+create database xoa;
+quit
+```
+
+```bash
+mysql -u root -p xoa < db.mysql.sql
+```
+
+Once ready please change the settings in local.yaml in order to enable MySQL support and switch userdb type to it
+
+```yaml
+# configuration of the MySQL server.
+mysql:
+    # Is MySQL enabled?
+    #
+    # Default: false
+    enabled: true
+
+    # host
+    #
+    # Default: localhost
+    #host: localhost
+
+    # port
+    #
+    # Default: 3306
+    #port: 3306
+
+    # username
+    #
+    # Default: xoauser
+    username: xoauser
+
+    # password
+    #
+    # Default: xoapass
+    password: xoapass
+
+    # database
+    #
+    # Default: xoa
+    database: xoa
+
+# Configuration of the userdb
+userdb:
+    # Type of the backend?
+    #
+    # Syntax: mysql, redis, postgres, ldap
+    #
+    # /!\ Currently supported backends: redis, mysql
+    #
+    # Default: redis
+    type: mysql
+
+```