Admin Add Roles

Admins should be able to add roles to people:< 54A3 /p>

On admin dashboard, create button called "Add Role To User" that leads to the add role page.
On add role page, options to find names
- Autocomplete
- Enter name
- Enter ID number
Select box for which role.
Submit button
- On submit: Update the role for the selected user for the current semester.
Only instructors should be able to create roles (ability.rb file).

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