Validation should be a callable endpoint #38
Description
Is your feature request related to a problem? Please describe.
Trying to create a deck a few bits at a time is not currently possible because the deck would consistently fail the validation until a complete and valid deck was created.
Describe the solution you'd like
A deck should be able to be created a few pieces of data at a time. Such as the name of the deck, and still be able to be saved.
Then cards should be able to be added a few at a time.
The endpoint could be called by the front-end in order to return a list of warnings about the deck when a user was either done, or working through it.
Describe alternatives you've considered
Implementing the warning / inspection into the React front-end, but this would mean duplicating the functionality already written. Perhaps porting it to React in the future would be worthwhile.
Additional context
This would also remove the need to complete #21