Student team can register as a Bangazon team

Provide an endpoint that student teams can use to register their organization as an active team. Ideally, the URL would be customized per cohort, and automatically add the new team to a Cohort collection that can be visualized in instructor dashboard.

## Team table

1. TeamId
2. TeamName
3. GithubOrgURL
4. CohortId

## Cohort table

1. CohortId
1. CohortName