add issue templates

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,19 @@
+---
+name: Feature request
+about: Suggest a new feature for tiptap
+title: ''
+labels: feature request
+assignees: ''
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. For example: I’m always frustrated when …
+
+**Describe the solution you’d like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you’ve considered**
+A clear and concise description of any alternative solutions or features you’ve considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.