Generate Code Documentation

Checkout master branch.
Open project in IntelliJ.
Go to Tools -> Generate JavaDoc
Make sure Generate JavaDoc scope -> Custom Scope is checked.
Click on three dotted icon to make custom scope.
Give name Custom_Docs.
Copy and paste following regex: !*..internal..*&&!test:*..*&&!lib:*..* into Pattern and click OK.
Uncheck Include test sources.
Select Output Directory.
Click OK.
This will generate HTML documentation in given Output Directory.
Browse Output Directory/index.html in browser.