Create a Spot

[ChristoGrab]

Creates and returns a new spot.

• An authenticated user is required for a successful response
• New spot exists in the database after request
• Spot data returned includes the id, ownerId, address, city,
  state, country, lat, lng, name, description, price, createdAt,
  and updatedAt
• Error response with status 400 is given when body validations for the
  address, city, state, country, lat, lng, name, description, or price are violated