Add first_author field on Submission model, form, view and template

[marceloFA]

Is your feature request related to a problem? Please describe.
A Submission instance is associated generally with an academic paper so we need a first_author field on the Submission model to identify properly the student in question (the first author)

Describe the solution you'd like
Adding first_author field on Submission model, form, view, and template would solve this

Describe alternatives you've considered
No alternatives came to my mind, we're open on considering other approaches to solve this

[beingbiplov]

Hey there , I can work on this issue.
Can you please provide additional information about first_author field and what it is suppose to do(it's purpose) in detail. @marceloFA

[marceloFA]

The issue description provide all info needed, almost. One thing I would add is that the first author field can only be filled with a Student instance that is associated with the related Event instance.
If you need any other info, just comment here.