Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
I want to create a new role and set it to the users via API.
So, the idea is to create two API methods:

1. Create a new role passing as arguments (name, scope, description)
2. Set a role to an user passing as arguments (room_id, user_id, role_id).

Describe alternatives you've considered
I can do this on the page below, but I need to do these actions via API.

Additional context
I search in the docs, but I can't found it how to do this. Please, let me know if there's an API method for this because otherwise, I'm thinking to contribute to the project for it.