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+## Why?
+
+Do you want to fix an error you have found? Do you have a suggestion to improve
+this application? I am open for discussion and welcome any help!
+
+## How?
+
+There are many ways to help me out. One way might be to open an issue on
+[Github's tracker](https://github.com/mssola/operum/issues) and start a
+discussion. For this, mind the following:
+
+- Check that the issue has not already been reported or fixed in `main`.
+- Try to be concise and precise in your description.
+- If you have found a problem, provide a step by step guide on how to reproduce it.
+- Provide the version you are using (git commit SHA).
+
+Another way is to simply submit a pull request. For this, also mind these:
+
+- Write a [good commit message](https://chris.beams.io/posts/git-commit/).
+- Tests continue to work (see `Testing` below).
+- The application continues to work.
+- The pull request has *only* one subject and a clear title. You are not
+  submitting a pull request with tons of different unrelated commits.
+
+## Testing
+
+Before doing anything at all make sure that your ruby version is as specified in
+the `.ruby-version` file, and that you have also installed `bundler`. After
+that, just run `bundle` to get all the gems as needed.
+
+Then prepare the database:
+
+```sh
+$ bundle exec rake db:setup
+```
+
+And finally, in order to run unit tests, simply run:
+
+```sh
+$ bundle exec rails test
+```
+
+System tests can also be run quite simply:
+
+```sh
+$ bundle exec rails test:system
+```
+
+And finally, make sure that the code follows the proper style:
+
+```sh
+$ bundle exec rubocop
+```