Update issue templates

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,27 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: 'Feature: XYZ'
+labels: ''
+assignees: ''
+
+---
+
+**Description, motivation and use case**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]. Give an example use case.
+
+**Proposed solution**
+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. An argument for why this solution is not the preferred one.
+
+**Example**
+Give a concise example of the envisioned featured. 
+
+**Additional context**
+Add any other context or screenshots about the feature request here.
+
+**Checklist**
+- [ ] I've assigned this issue to a project
+- [ ] I've @-mentioned relevant people