Add multiple initial admins feature (lab07 starter code) to this codebase

[pkuang5]

To initially add more admins, you must edit application.properties where it says app.admin.email to have the emails that you want to have admin access.

Example: app.admin.email=pkuang@ucsb.edu, random@ucsb.edu, random2@ucsb.edu

[moshehaiem]

Edit app.admin.email in the application.properties file and add the admins that you want to have initial access.