Add Admin Form

[cheetodustflori]

1. Update Add Admin Form so it connects to database (?) -- actually I think Manh said that admin credentials are done using CustomCred or whatever. Helpful otes here: https://docs.google.com/document/d/1bkDVGw2uHFMzI1JB9VOb12XR1Iv9S6JJoXoBXReY_Z4/edit?usp=sharing
2. Update UI