docs: Include the 'CONTRIBUTING.md' explanation.

Author: dylan-sutton-chavez

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# How to Contribute to Edge Python
+
+Thanks for your interest in contributing to Edge. This document outlines some recommendations on how to contribute.
+
+## Issues and Feature Requests
+
+Please provide a failing example if possible to help with issue reproduction.
+
+## Pull Requests
+
+For large changes, please try reaching out to the Edge maintainers via GitHub Issues or Email to ensure that the change can be accepted once it is ready.
+
+Run the following commands before sending a pull request to ensure code quality:
+
+- `cargo wasm` Build the `compiler.wasm`.
+- `cargo test --release --no-default-features` Run the compiler test suite.
+- `cargo clippy --all-targets --no-default-features -- -D warnings` Lint the Rust code.
+
+*Other packages have their own build and test setup — take a look at the `README.md` in the relevant path.*
+
+A CI job will be run by the maintainer after the PR has been created.