* Add initial api docs using drf-spectacular
This commit adds the inital and basic docs using drf-spectacular.
It also adds some serializers to be used for automatically
generating response objects by drf-spectacular
* Update api docs with correct request and response objects
- TODO: /order route
* Fix typo in api docs
* Separate OpenAPI schemas into it's own file
* Update drf-spectacular and add API intro and logo
* Update API docs for GET /order
* Add api docs for POST /order route
* Update serializers.py
