add contributing guidelines to repo

**TAKE INSPIRATION** FROM THE FOLLOWING WRITEUP AND ADAPT ACCORDINGLY

Contributing
The main purpose of this repository is to continue evolving React core, making it faster and easier to use. Development of React happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving React.

[Contributing Guide](https://legacy.reactjs.org/docs/how-to-contribute.html)
Read our [contributing guide](https://legacy.reactjs.org/docs/how-to-contribute.html) to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React.

Start by reviewing the linked React contributing guide and the repository description to understand how its guidance should be adapted for the satellite on-board computer project. Add repository-specific contributing guidance based on the issue’s writeup, with development and contribution expectations that fit this project. Done means the repository contains a clear contributing guide rather than copied React text.

Written by the indexing model from the issue text.