add CONTRIBUTING.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "Bug report"
+about: Report a bug or unexpected behavior in rust-rpxy
+title: "[Bug] "
+labels: bug
+assignees: ""
+---
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+---
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Run '...'
+3. See error
+
+---
+
+## Expected behavior
+
+What did you expect to happen?
+
+---
+
+## Environment
+
+- rust-rpxy version:
+- OS:
+- Rust version:
+- Configuration file (sanitized if necessary):
+
+---
+
+## Additional context
+
+Add any other context about the problem here.
+
+---
+
+## Important notes
+
+- Please provide sufficient detail (logs, configs, reproduction steps). Issues without this may be closed as incomplete.
+- This project is maintained on a best-effort basis.
+- This project is primarily driven by the code owner's personal interests, not by commercial demand or contractual obligations.