Adding an issue template.

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: "🐞 Bug Report"
+about: Create a report to help us improve Lemmy
+title: ''
+labels: 'type:bug'
+assignees: ''
+
+---
+
+Found a bug? Please fill out the sections below. 👍
+
+### Issue Summary
+
+A summary of the bug.
+
+
+### Steps to Reproduce
+
+1. (for example) I clicked login, and an endless spinner show up.
+2. I tried to install lemmy via this guide, and I'm getting this error.
+3. ...
+
+### Technical details
+
+* Please post your log: `sudo docker-compose logs > lemmy_log.out`.
+* What OS are you trying to install lemmy on? 
+* Any browser console errors?

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: "🚀 Feature request"
+about: Suggest an idea for improving Lemmy
+title: ''
+labels: 'type:enhancement'
+assignees: ''
+
+---
+
+### Is your proposal related to a problem?
+
+<!--
+  Provide a clear and concise description of what the problem is.
+  For example, "I'm always frustrated when..."
+-->
+
+(Write your answer here.)
+
+### Describe the solution you'd like
+
+<!--
+  Provide a clear and concise description of what you want to happen.
+-->
+
+(Describe your proposed solution here.)
+
+### Describe alternatives you've considered
+
+<!--
+  Let us know about other solutions you've tried or researched.
+-->
+
+(Write your answer here.)
+
+### Additional context
+
+<!--
+  Is there anything else you can add about the proposal?
+  You might want to link to related issues here, if you haven't already.
+-->
+
+(Write your answer here.)

.github/ISSUE_TEMPLATE/QUESTION.md

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+---
+name: "? Question"
+about: General questions about Lemmy
+title: ''
+labels: 'type:question'
+assignees: ''
+
+---
+
+What's the question you have about lemmy?
+