Added issue template for feature requests

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature request
+about: Suggest a feature for the generator
+title: ''
+labels: enhancement
+assignees: scymtym
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+Example: When I call the generator like this:
+```sh
+build-generator generate …
+```
+the output does not tell me …
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+Example: It would be really helpful if the output of the above contained something like
+```
+…
+```