First entity: Event, without user, participators, and chat messages

[Daggerpov]

Create:

• [x] Endpoint
• [x] Service
• [x] Repository
• [x] Entity

For an event with: title, start time, end time, location, and note.

Don't include: creator, participators, and chat messages for now

[Daggerpov]

• [x] Make a GET endpoint (get event)
• [x] Make a POST endpoint (create event)

[Daggerpov]

• [ ] setup that model in the database with just those properties for now