Create players endpoints.

[EugeniaMusiime]

Players:

• POST: players/ -> Create a new player
• GET: players/ -> Get a list of players
• GET: players/{id} -> Get details of a specific player
• PUT: players/{id} -> Update details of a specific player
• PATCH: players/{id} -> Update specific fields of a specific player
• DELETE: players/{id} -> Update details of a specific player

# TODOs:

• Model that connects to the database table.
• Serializer that serializes the Model
• View that is connected to the serializer
• URL that provides the data as an output to the client