add CONTRIBUTING.md

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "Feature request"
+about: Suggest an idea for rust-rpxy
+title: "[Feature] "
+labels: enhancement
+assignees: ""
+---
+
+## Feature description
+
+A clear and concise description of the feature you are requesting.
+(What do you want to happen?)
+
+---
+
+## Motivation
+
+Why is this feature important for your use case?
+(Please describe the problem you are facing, not only the desired solution.)
+
+---
+
+## Alternatives considered
+
+Have you considered any alternatives or workarounds?
+(Please describe what you tried, e.g., configuration changes, external tools, or client-side modifications.)
+
+---
+
+## Your contribution
+
+Would you be willing to:
+
+- [ ] Submit a Pull Request implementing this feature
+- [ ] Sponsor the development (via GitHub Sponsors / other)
+
+---
+
+## Important notes
+
+- Features that cause compatibility issues or are out of project scope may be declined.
+- This project is maintained on a best-effort basis. Requests without contributions (PR or sponsorship) may not be prioritized.
+- This project is primarily driven by the code owner's personal interests, not by commercial demand or contractual obligations.