Github templates add support question and documentation issue (#10613)

.github/ISSUE_TEMPLATE/2_Feature_request.md

@@ -0,0 +1,19 @@
+---
+name: 🚀 Feature Request
+about: Suggest an idea for this project
+
+---
+
+For general questions please use [PX4 Discuss](http://discuss.px4.io/) or [Slack](http://slack.px4.io/).
+
+**Describe problem solved by the proposed feature**
+A clear and concise description of the problem, if any, this feature will solve. E.g. I'm always frustrated when ...
+
+**Describe your preferred solution**
+A clear and concise description of what you want to happen.
+
+**Describe possible alternatives**
+A clear and concise description of alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots for the feature request here.