[WIP] Adding an invitation mechanism for beta access

                   
|Q            |A  |
|---          |---|
|Bug Fix?     |n  |
|New Feature? |y  |
|BC Breaks?   |n  |
|Deprecations?|n  |
|Tests Pass?  |y  |
|Fixed Tickets|#6  |
|License      |MIT|
|Doc PR       |-  |