Create CONTRIBUTING.md

CONTRIBUTING.md

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+## How to contribute
+
+1. Fork the repo
+2. Make sure there is an open issue or a task in the [project](https://github.com/users/radumarias/projects/7/views/1)
+3. **Assign it to you and move it in the corresponding status column as you are working on it**
+4. Make the changes in your fork
+5. If you add new `.rs` files in `examples` member add all these [lines](https://github.com/radumarias/rencfs/blob/main/src/lib.rs#L1-L16) as first ones
+6. If you add new packages to the workspace add all these [lines](https://github.com/radumarias/rencfs/blob/main/src/lib.rs#L1-L16) to it's `lib.rs`
+   and to any `bin` files (
+   like `main.rs` or other files declared as `[[bin]]`)
+7. Add tests for your changes, if applicable
+8. `cargo fmt --all`, you can configure your **IDE** to do this on
+   save, [RustRover](https://www.jetbrains.com/help/rust/rustfmt.html)
+   and [VSCode](https://code.visualstudio.com/docs/languages/rust#_formatting)
+9. Create a **PR** back to **main** repo to the `main` branch
+10. Monitor the checks (GitHub actions run)
+11. Respond to any comments
+12. In the end, ideally, it will be merged to `main`