[Blocked due to #5 and #28] Implement Swagger UI/ GitHub Pages

[lcho]

• this will help with API documentation
• Sample: https://petstore.swagger.io/?_ga=2.65739052.323585376.1597461448-1278182462.1597461448#/

[lcho]

Instead of Swagger UI, I think we should look into the Github Pages feature:
https://www.codecademy.com/articles/f1-u3-github-pages#:~:text=Adding%20GitHub%20Pages%20Projects&text=In%20GitHub%2C%20navigate%20to%20your,branch%20and%20then%20click%20Save.