Add contributing

CONTRIBUTING.md

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+# How to contribute
+
+Feel free to:
+
+- [Make an issue](https://help.github.com/articles/creating-an-issue/)
+- [Make a pull request](https://services.github.com/on-demand/github-cli/open-pull-request-github) into the `develop` branch
+
+Here is how you can help, a lot of steps are related to GitHub, not specifically my roles.
+
+## 1. Create an issue
+
+When you see some issue or have an idea for improvement, [create an issue](https://github.com/monolithprojects/ansible-github_actions_runner/issues).
+
+## 2. Fork the project
+
+Click on `fork` on the top-right corner and fork the repository.
+
+## 3. Make the changes
+
+Do dthe changes in your own GitHub namespace.
+
+## 4. Test the changes
+
+**Note:** I will test the role again, so you don't need to do that if you don't want to.
+
+Install [molecule](https://molecule.readthedocs.io/en/stable/) and run the test:
+
+```bash
+pip install molecule ansible-lint docker
+cd ansible-github_actions_runner
+molecule test
+```
+
+## 5. Create a pull request
+
+Please create a pull request into the `develop` branch. Here is [how to do it](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request-from-a-fork).
+
+
+Please consider to [sponsor](https://github.com/sponsors/monolithprojects) me :-)