Quick facts:
What can users do with it and how? Ideally, create subsections per capability, ideally in the form of performing actions ("Launching the application", "Adding a new response", etc.)
How can programmers modify or add functionality?
List of common known issues, like why something isn't working, why it's implemented in a certain way, limitations, etc. If there are major Jira tickets, link to those as well.
Link to the appropriate section in the main FAQ page.