Add contributing docs

Author: AlanFoster

CONTRIBUTING.md

@@ -0,0 +1,97 @@
+# Contributing to Superglue Rails
+
+We love pull requests from everyone. By participating in this project, you
+agree to abide by the thoughtbot [code of conduct].
+
+[code of conduct]: https://thoughtbot.com/open-source-code-of-conduct
+
+Here are some ways *you* can contribute:
+
+* by using alpha, beta, and prerelease versions
+* 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/thoughtbot/superglue_rails/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 a reproduction script and 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
+
+Ensure you have cloned [props_template][props_template] in the parent directory:
+
+```sh
+cd ..
+git clone [email protected]:thoughtbot/props_template.git
+```
+
+You can use the development `Gemfile` by
+
+```sh
+bundle install
+```
+
+## Running the test suite
+
+Running unit tests:
+
+```sh
+bundle exec rake test
+```
+
+Running acceptance tests:
+
+```sh
+ruby -Ilib:test test/acceptance/superglue_installation_acceptance.rb
+```
+
+## Formatting
+
+Use [standard] to automatically format your code:
+
+```sh
+bundle exec rake standard:fix
+```
+
+[repo]: https://github.com/thoughtbot/superglue_rails/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/middleman/middleman-heroku/blob/master/CONTRIBUTING.md

README.md

@@ -27,6 +27,7 @@ Documentation is hosted on [Github pages](https://thoughtbot.github.io/superglue
 
 ## Contributing
 
-Thank you, [contributors]!
+See the [CONTRIBUTING] document. Thank you, [contributors]!
 
+  [CONTRIBUTING]: CONTRIBUTING.md
   [contributors]: https://github.com/thoughtbot/superglue_rails/graphs/contributors