Add issue templates (closes #18)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Tell us what's wrong and how we can make it right!
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+- [ ] I have described the bug and its impact.
+- [ ] I have listed the steps to reproduce this bug, possibly including screenshots or CLI output if necessary.
+- [ ] I have provided the `--version` of Tuwunel and the type of package and all other relevant version information.
+- [ ] I have read and adhered to the [CoC](https://github.com/matrix-construct/tuwunel/blob/main/CODE_OF_CONDUCT.md)
+- [ ] I am not linking to other projects even if a similar bug has been fixed or submitted to their ticket system.
+
+### Summary
+...
+
+### Steps to reproduce
+1.
+
+### My:
+- Tuwunel Version:
+- Client and/or Bridge Version:
+- Architecture/OS Platform:
+- How I build and deploy Tuwunel: (e.g. docker image, RPM, cargo build, etc).

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+- [ ] I have described the feature and its value to myself and others.
+- [ ] I have read and adhered to the [CoC](https://github.com/matrix-construct/tuwunel/blob/main/CODE_OF_CONDUCT.md)
+- [ ] I am not linking to other projects even if a similar feature exists in their code or ticket system.
+
+### Description