Update README with new Contact/CoC blocks

Taken from the rp-hal repo, for consistency.

Author: jonathanpallant

README.md

@@ -43,13 +43,50 @@ For a release build
 DEFMT_LOG=trace cargo run --release
 ```
 
+<!-- ROADMAP -->
+## Roadmap
+
+NOTE These packages are under active development. As such, it is likely to
+remain volatile until a 1.0.0 release.
+
+See the [open issues](https://github.com/rp-rs/rp-hal/issues) for a list of
+proposed features (and known issues).
+
+## Contributing
+
+Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are **greatly appreciated**.
+
+The steps are:
+
+1. Fork the Project by clicking the 'Fork' button at the top of the page.
+2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
+3. Make some changes to the code or documentation.
+4. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
+5. Push to the Feature Branch (`git push origin feature/AmazingFeature`)
+6. Create a [New Pull Request](https://github.com/rp-rs/rp-hal/pulls)
+7. An admin will review the Pull Request and discuss any changes that may be required.
+8. Once everyone is happy, the Pull Request can be merged by an admin, and your work is part of our project!
+
+## Code of Conduct
+
+Contribution to this crate is organized under the terms of the [Rust Code of
+Conduct][CoC], and the maintainer of this crate, the [rp-rs team], promises
+to intervene to uphold that code of conduct.
+
+[CoC]: CODE_OF_CONDUCT.md
+[rp-rs team]: https://github.com/orgs/rp-rs/teams/rp-rs
+
 ## License
 
-This project is licensed under either of
+The contents of this repository are dual-licensed under the _MIT OR Apache
+2.0_ License. That means you can chose either the MIT licence or the
+Apache-2.0 licence when you re-use this code. See `MIT` or `APACHE2.0` for more
+information on each specific licence.
 
-- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
-  http://www.apache.org/licenses/LICENSE-2.0)
+Any submissions to this project (e.g. as Pull Requests) must be made available
+under these terms.
 
-- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+## Contact
 
-at your option.
+Raise an issue: [https://github.com/rp-rs/rp2040-project-template/issues](https://github.com/rp-rs/rp2040-project-template/issues)
+Chat to us on Matrix: [#rp-rs:matrix.org](https://matrix.to/#/#rp-rs:matrix.org)