Add issue templates

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,19 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Description
+
+
+<!--
+  Please include whether you're interested in implementing this feature yourself.
+
+  In many cases, a feature doesn't land solely because there isn't enough interest or motivation for someone to implement it.
+
+  Thanks for proposing ways to improve outline.nvim!
+-->