This app was mentioned in 2 comments, with an average of 2.00 upvotes
Check this out. What you've described already exists, so I wouldn't recommend spending time to recreate it unless you have major design improvements or plan to include information it doesn't.
NMUN's rules (PDF) are used widely and internationally.
They're also available in the Model UN mobile app
full disclosure: I'm the product manager for the mobile apps.