Spike: Integrate Doorkeeper for our API Authentication

[ndeto]

I'd like us to do an integrate Doorkepeer into our backend in order to have an API for user authentication. This will be used by The Just-a-kashort-drive platform to authenticate users.

Checkout Doorkeeper docs https://doorkeeper.gitbook.io/guides/ruby-on-rails/getting-started
Github: https://github.com/doorkeeper-gem/doorkeeper

Reference for the spike format - https://docs.google.com/document/d/1TTqurbDh7XivY5w0bqLZWncPiI5-zDSEIPLUCn5dgXM/edit

1. Purpose
2. Current situation
3. Proposed Solution/s
4. Requirements. Both business (costs, third party agreements e.t.c), and technical (sample request and response bodies, light diagrams)
5. Conclusion