feat: add issue templates

.github/ISSUE_TEMPLATE/1_bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help improve BetterYTM
+title: ''
+labels: bug
+assignees: Sv443
+
+---
+
+### Description of the bug and steps to reproduce
+<!-- A clear and concise description of what the bug is -->
+<!-- Also include steps to reproduce it -->
+
+### Environment
+- Browser name: 
+- Browser version: 
+- Userscript version & build number: 
+<!-- To view the userscript version and build number, open the JavaScript console (usually with F12). It should be near the very top. -->
+
+### Other info / screenshots
+<!-- If applicable and possible, add other information or screenshots to help explain your problem. -->

.github/ISSUE_TEMPLATE/2_feature_request.md

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+---
+name: Feature request
+about: Suggest a new or improved feature for BetterYTM
+title: ''
+labels: enhancement
+assignees: Sv443
+
+---
+
+### Description of the feature
+<!-- A clear and concise description of what feature you want to be added to BetterYTM -->
+
+### Other info / sketches
+<!-- If applicable and possible, add other information or sketches to help explain your suggestion -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: "Discussions"
+    about: "Open a new thread on the discussion board if you have a question, want to show off your project, etc."
+    url: "https://github.com/Sv443/BetterYTM/discussions"
+  - name: "Chat on Discord"
+    about: "If you want, you can also join my Discord server"
+    url: "https://dc.sv443.net"