Create CONTRIBUTING.md

Author: alex

Diff for: CONTRIBUTING.md

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+# Contributing
+
+We're always excited to have contributions of any form!
+
+Examples of contributions include:
+
+* Code patches
+* Documentation improvements
+* Bug reports and patch reviews
+
+## Filing issues
+
+If you're filing an issue for a build error, please include enough information
+for us to diagnose and reproduce the issue. This generally means, at a minimum
+the kernel version (and, if it's not a vanilla upstream kernel, where you got
+the kernel from) and your compiler versions (Rust, Clang, and GCC).
+
+## Contributing code
+
+To contribute code, you can send a pull request on Github. Please make sure your
+code is formatted with `cargo fmt`, builds, the tests pass, and it's `cargo
+clippy`-clean. Don't worry, we've got continuous integration if you miss
+anything.