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CONTRIBUTING.md

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+# Contributing
+
+VPN Share is designed as a serious networking project. Contributions should
+preserve the core product constraints:
+
+- No root requirement.
+- No manual proxy or routing setup for users.
+- Existing VPN apps on the phone remain the upstream.
+- Companion clients configure their own local virtual interfaces.
+- No traffic-content logging.
+
+## Development Checks
+
+```bash
+cargo fmt --check
+cargo test --workspace
+```
+
+Android checks require a working Gradle/Android SDK setup:
+
+```bash
+gradle :apps:android:app:lintDebug
+gradle :apps:android:app:assembleDebug
+```
+
+## Code Style
+
+- Keep packet/protocol logic in Rust crates where possible.
+- Keep Android platform glue thin and testable.
+- Avoid adding dependencies to security-sensitive parsing paths without review.
+- Public protocol changes require docs and compatibility tests.