Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Astronoby
+
+By participating in this project, you agree to follow the [code of conduct].
+
+[code of conduct]: https://github.com/rhannequin/astronoby/blob/main/CODE_OF_CONDUCT.md
+
+Here are some ways *you* can contribute:
+
+* by reporting bugs
+* by suggesting new features
+* by writing or editing documentation
+* by writing specifications
+* by writing code (**no patch is too small** : fix typos, add comments, etc.)
+* by refactoring code
+* by closing [issues]
+* by reviewing patches
+
+[issues]: https://github.com/rhannequin/astronoby/issues
+
+## Submitting an Issue
+
+* We use the [GitHub issue tracker][issues] to track bugs and features.
+* Before submitting a bug report or feature request, check to make sure it hasn't
+  already been submitted.
+* When submitting a bug report, please include any other details that may be
+  necessary to reproduce the bug, including your gem version, Ruby version, and
+  operating system.
+
+## Cleaning up issues
+
+* Issues that have no response from the submitter will be closed after 30 days.
+* Issues will be closed once they're assumed to be fixed or answered. If the
+  maintainer is wrong, it can be opened again.
+* If your issue is closed by mistake, please understand and explain the issue.
+  We will happily reopen the issue.
+
+## Submitting a Pull Request
+
+1. [Fork][fork] the [official repository][repo].
+1. [Create a topic branch.][branch]
+1. Implement your feature or bug fix.
+1. Add, commit, and push your changes.
+1. [Submit a pull request.][pr]
+
+### Notes
+
+* Please add tests if you changed code. Contributions without tests won't be accepted.
+* If you don't know how to add tests, please put in a PR and leave a comment
+  asking for help. We love helping!
+* Please don't update the Gem version.
+
+## Setting up
+
+```sh
+bin/setup
+```
+
+## Running the test suite
+
+The default rake task will run the full test suite:
+
+```sh
+bundle exec rake
+```
+
+To run an individual rspec test, you can provide a path and line number:
+
+```sh
+bundle exec rspec spec/path/to/spec.rb:123
+```
+
+## Formatting
+
+Use [standard] to automatically format your code:
+
+```sh
+bundle exec standardrb --fix
+```
+
+[repo]: https://github.com/rhannequin/astronoby/tree/main
+[fork]: https://help.github.com/articles/fork-a-repo/
+[branch]: https://help.github.com/articles/creating-and-deleting-branches-within-your-repository/
+[pr]: https://help.github.com/articles/using-pull-requests/
+[standard]: https://github.com/testdouble/standard
+
+Inspired by https://github.com/thoughtbot/factory_bot/blob/main/CONTRIBUTING.md