Create feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+
+
+## Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is. Ex. I'm always using this feature but am missing [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.
+
+## Your Environment
+<!--- Include as many relevant details about your environment -->
+* Director version (System - About):
+* Icinga Web 2 version and modules (System - About):
+* Icinga 2 version (`icinga2 --version`):
+* Operating System and version:
+* Webserver, PHP versions:
+