docs(developer-guide): Update checks, services and include testing (#2705)

Co-authored-by: Sergio Garcia <sergargar1@gmail.com>

docs/tutorials/developer-guide/documentation.md

@@ -0,0 +1,8 @@
+## Contribute with documentation
+
+We use `mkdocs` to build this Prowler documentation site so you can easily contribute back with new docs or improving them.
+
+1. Install `mkdocs` with your favorite package manager.
+2. Inside the `prowler` repository folder run `mkdocs serve` and point your browser to `http://localhost:8000` and you will see live changes to your local copy of this documentation site.
+3. Make all needed changes to docs or add new documents. To do so just edit existing md files inside `prowler/docs` and if you are adding a new section or file please make sure you add it to `mkdocs.yaml` file in the root folder of the Prowler repo.
+4. Once you are done with changes, please send a pull request to us for review and merge. Thank you in advance!