Add GitHub templates

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: 'Feature request'
+about: 'Suggest an idea for headscale'
+title: ''
+labels: [ 'enhancement' ]
+assignees: ''
+---
+
+**Feature request**
+<!-- A clear and precise description of what new or changed feature you want. -->
+
+<!-- Please include the reason, why you would need the feature. E.g. what problem
+  does it solve? Or which workflow is currently frustrating and will be improved by
+  this? -->