Create draft data model

[chris-nowicki]

@shashilo to clarify, this task is the draft db model for weekly pics, yes?

[shashilo]

I believe this would be for the weekly picks and the NFL teams tables. Since those are both custom.

[choir27]

https://dbdiagram.io/d/Copy-of-Gridiron-data-model-661db74203593b6b6110675c