Add documentation

[emman27]

I've actually done 2 things here.

1. Django Rest Swagger is added as a project dependency and the relevant views are available at /documentation. This should support your future development should you choose to go down the path of viewsets and routers, as recommended by rest_framework itself.

2. I've also added a documentation.yaml file to your project - in the OpenAPI 3.0 format documenting your custom views, with data schemas which are rather extensible (I hope). This should also support your needs if you decide for something more customized.

   • You're not supposed to read the yaml file directly. Try opening it in any OpenAPI 3.0 visualization tool (I like https://temando.github.io/open-api-renderer/demo/) or Swagger Editor

Resolves #29

[emman27]

Silly me forgot about the October 1st startdate >< Will put this in again tomorrow!