[meta] Add issue templates

.github/ISSUE_TEMPLATE/1_Bug_report.md

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+---
+name: "⚠️ Bug report"
+about: Use this template to create a bug report
+
+---
+
+**Actual behavior (the bug)**
+A description of what happened
+
+**Expected behavior**
+A description of what you expected to happen
+
+**To Reproduce**
+Steps to reproduce the behavior
+
+**Additional context**
+Add any other context about the bug here

.github/ISSUE_TEMPLATE/2_Feature_request.md

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+---
+name: "\U0001F6A9 Feature request"
+about: Use this template to suggest/request a feature
+
+---
+
+**Describe the feature**
+A description of the feature
+
+**Additional context**
+Add any other context about the feature request here

.github/ISSUE_TEMPLATE/3_Question.md

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+---
+name: "\U0001F4AC Question"
+about: Use this template to ask a question
+
+---
+
+**Describe your question**

.github/ISSUE_TEMPLATE/4_General.md

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+---
+name: "\U0001F4DD General issue"
+about: Use this template if the other templates don't fit
+
+---
+
+**Describe your issue**