Add feature issue template

Author: mrsimpson

.github/ISSUE_TEMPLATE/feature.md

@@ -0,0 +1,28 @@
+---
+name: Feature
+about: A pretty vague description of how a capability of our software can be added or improved.
+title: ''
+labels:
+  - feature
+assignees: ''
+---
+
+# Motivation
+
+<!-- What capability should be either established or improved? How is life of the target audience better after it's been done? -->
+
+# Scope
+
+<!-- This is kind-of the definition-of-done for a feature. 
+Try to keep the scope as small as possible and prefer creating multiple, small features which each solve a single problem / make something better
+-->
+
+# Options
+ 
+<!-- If you already have an idea how this can be implemented, please describe it here. 
+This allows potential other contributors to join forces and provide meaningful feedback prio to even starting work on it.
+-->
+
+# Related
+
+<!-- Link to the epic or other issues or PRs which are related to this feature. -->