Add an API endpoint which adds an external game to the collection

[FusTaFah]

We need an endpoint, something like POST /games/collection, which takes an external game ID and platform ID and adds it to the collection. This is going to require creating a database which will allow us to persist the data.

Also, this may be a bit weird but I have this idea of separating the game data and the collection into separate models. A games table should contain:

• id
• external_id
• external_url - Link to IGDB
• title
• description
• image - URL to an image in IGDB - let's just hotlink images for now

Then we have a collection table which just contains a list of the game IDs that are in the collection. Let's make everything work with a single collection across the entire app for now and then add in user accounts later.

The endpoint should return a 201 response if the game was added to the collection and a 200 response if the game already exists. The response body should be the game data of the added game.

[michaelenger]

We're going to be doing something different, so closing this.