Add how to contribute:

CONTRIBUTING.md

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+# Contributing
+
+Thanks for considering to contribute and reading this!
+
+Here we discuss how to contribute
+
+- [Spoken text](#spoken-text), e.g. ideas, feedback, messages, etc. and are written in English.
+- [Code](#code), e.g. textual changes where the text is formatted in Markdown
+
+## Spoken text
+
+Spoken text are ideas, feedback, messages, etc. and are written in English.
+
+For ideas or feedback, create an [Issue](https://github.com/UPPMAX/uppmax_intro_python/issues).
+These Issues will be discussed in a meeting and/or below that Issue.
+
+Ideas that improve the experience of UPPMAX users trying to use our resources will likely be accepted.
+
+## Code
+
+We welcome any contribution that:
+
+- improves the experience of our learners
+- follow all standards set by the continuous integration tools (e.g. use 4 spaces for indentation)
+
+As an UPPMAX contributor, one can contribute by:
+
+1. Clone this repository
+1. Add a branch
+1. Work on your branch
+1. When done, create a Pull Request from your branch to `main`
+1. If the change is accepted after review it will be merged into the main branch
+1. Your branch will be deleted after merging
+
+As an external contributor, one can contribute by:
+
+1. Fork this repository
+1. Modify your Fork
+1. When done, creating a Pull Request from your Fork to this repository,
+   merging to the `main` branch is fine :-)
+1. If the change is accepted after review it will be merged into the main branch