add Feature requeest template

.gitlab/issue_templates/Feature.md

@@ -0,0 +1,19 @@
+Feature Request
+===============
+Summary
+-------
+[//]: # (Please write a concise description of the feature you would like implemented.)
+
+Prerequisites
+-------------
+[//]: # (Include links to other feature requests or problems that would need to be handled before implementing this.)
+
+Proposed Implementation
+-----------------------
+[//]: # (If you have an idea of how the feature should be implemented please write it down here.)
+
+References
+----------
+[//]: # (Please provide links to projects which implement something similar, or projects that could be used to implement this feature.)
+
+/label ~feature