Improve onboarding docs

CONTRIBUTING.md

@@ -0,0 +1,29 @@
+# Contributors Guide
+
+Thanks for helping out with Nexus!
+
+## Coding guidelines
+
+* Code should compile on all of mac, windows, linux (we will eventually check that in
+ CI).
+* We enforce `cargo fmt` and `cargo clippy` in CI.
+* Files should end in newlines.
+* Try to keep examples as minimal as possible.
+* Be sure to use [our discord](https://discord.gg/VQxSKJUa9F) to keep in touch :)
+* Dependencies of your code should not use viral licenses like GPL or LGPL (MPL is
+ fine) or unlicensed code - if you're not sure, feel free to ask us if the license is
+ ok.
+
+## License
+
+Unless otherwise specified, all code in this repository is dual-licensed under
+either:
+
+- MIT License ([LICENSE-MIT](LICENSE-MIT))
+- BSD 2-Clause Plus Patent License ([LICENSE-BSD](LICENSE-BSD))
+
+at your option. This means you can select the license you prefer!
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, shall be dual licensed as above, without any
+additional terms or conditions.

README.md

@@ -102,6 +102,10 @@ the skills/demos that interest you for instructions on how to run them.
 - `direnv allow`
 - `git lfs install && git lfs pull`
 
+## Contributions
+
+See [CONTRIBUTING.md](CONTRIBUTING.md).
+
 ## License
 
 Unless otherwise specified, all code in this repository is dual-licensed under