2. Get One Market

[JorjaF]

Details:
This endpoint should follow the pattern of GET /api/v0/markets/:id.
If a valid market id is passed in, all market attributes, as well as a vendor_count should be returned.
If an invalid market id is passed in, a 404 status as well as a descriptive error message should be sent back in the response.

example 1
Request:

 GET /api/v0/markets/322458
 Content-Type: application/json
 Accept: application/json

Response: status: 200

{
"data": {
"id": "322458",
"type": "market",
"attributes": {
"name": "14&U Farmers' Market",
"street": "1400 U Street NW ",
"city": "Washington",
"county": "District of Columbia",
"state": "District of Columbia",
"zip": "20009",
"lat": "38.9169984",
"lon": "-77.0320505",
"vendor_count": 1
}
}
}

Example #2 😭
Request:

 GET /api/v0/markets/123123123123 (where `123123123123` is an invalid Market id)
 Content-Type: application/json
 Accept: application/json

Response: status: 404

{
"errors": [
{
"detail": "Couldn't find Market with 'id'=123123123123"
}
]
}