It is important to have as much information as necessary in the project help page so others can easily join, know what is going on, and become fully part (or even lead) the project. If there is a lot of information to add, you may like to create 'child pages' so it is better organised.
Some sections you may like to add to your project:
1) Aim: What is trying to be achieved by this project?
2) What has been achieved so far? (Including the history can help others learn about how to do it)
3) What still needs to happen? (2 and 3 might be repeated for each project)
4) Learning: What skills, tools, resources, websites (etc) are useful to learn the skills to be able to be a) a part of this group b) a leader of this group?
5) Communication: how does the group communicate? This may be by a discussion section in the group.
6) Joining: How does someone join this group?
7) Starting: How does someone start such a group as this?
8) Other: Any other points that needs to be said?