While we have created a separate project to provide documentation for our new software product, GitLab also has a system for creating documentation by default. It is the Wiki feature. Every project can easily enable this feature and you will then have a full-blown wiki system available.
When you navigate to the Wiki through the left navigation bar in your project you will be presented with the following screen:
If you create a new wiki, you will have to provide a title, the markup language used, and then you can start adding content. As all the information is itself saved in an accompanying Git repository, you can give the Commit message ...