Jm/database migrations 1

[jdmchugh111]

Description of Changes

Created database migrations for users and links. Will fix forward with migrations for tags once we have a better understanding of how the tagging functionality works. Also created models and model testing for User and Link classes. Also created and updated the README

What are the relevant tickets (if any)

This PR is related to issue #8 , and will be closed upon successful merge of this PR request.

Testing

Wrote model tests for relationships and validations. All passing - test coverage is 100%

Checklist

• [X] The code follows the project's coding standards.
• [X] Unit tests have been added or updated to cover the changes.
• [X] Documentation has been updated to reflect the changes (if applicable).
• [X] The code compiles without errors.
• [X] The changes have been tested locally and pass all relevant tests.
• [X] All new and existing tests pass.
• [ ] The pull request has been reviewed by at least one other contributor.

[jdmchugh111]

solid work. Thanks for adding the factories here too.

Yeah, I actually didn't intend to add the factories like that - I think they autogenerated when I used rails g model. Probably will need to adjust the factories to incorporate Faker, but other than that they look solid. Just will need to make sure that you establish an existing user_id when you're creating a new Link