chore: restore issue templates

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,26 @@
+---
+name: "🚀 Feature Request"
+about: "I have a suggestion (and may want to implement it!)"
+
+---
+
+<!--
+IMPORTANT: Feature requests on this GitHub issue tracker are only accepted in case they have been approved by a core developer or contain extensive argumentation and directions for implementation. For all other feature requests, ideas and feedback please post in the Flarum Community: https://discuss.flarum.org/t/feedback.
+-->
+
+## Feature Request
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. eg. I have an issue when [...]
+
+**Describe the solution you'd like**
+A detailed description of your proposed solution. Include:
+- How the feature would work/behave
+- Any potential drawbacks
+- Maybe a screenshot, design, or example code
+
+**Justify why this feature belongs in Flarum's core, rather than in a third-party extension**
+Consider who this change will be useful to – most Flarum forums, or just a few?
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.