meta: add initial issue templates

This commit adds the following issue categories:
- Bug report
- Feature request
- Support

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,23 @@
+---
+name: Feature request
+about: Suggest an idea for Oh My Zsh
+title: ''
+labels: 'Type: feature request'
+assignees: ''
+
+---
+
+**Is your feature request related to a particular plugin or theme? If so, specify it.**
+The name of the plugin or theme you'd like us to improve.
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. 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.