Add CONTRIBUTING.md

Author: nbdd0121

CONTRIBUTING.md

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+# Contributing
+
+There is currently no specific guidelines for contributing to klint.
+However, you should in general follow the guidelines to contribute to the Linux kernel and the Rust language.
+
+## Generated Contents
+
+There is no ban on using langauge models to assist development, but doing so should follow [generated content guideline](https://www.kernel.org/doc/html/next/process/generated-content.html) in the kernel.
+Pull requests that are fully or mainly generated by AI is not welcome and will be closed in line with [burdensome PR policy](https://github.com/rust-lang/compiler-team/issues/893) of the Rust compiler.