Product Enhancements

Things to be done:

Create contributing documents: CONTRIBUTING.md, CODE_OF_CONDUCT.md, and CHANGELOG.md.

Done:

[x] Tests (#2).
[x] CI/CD for black, isort, mypy, pytest (#2).
[x] Website implementation with design and graph visualization (#3).
[x] Better API endpoint for daily progression, with faster speed and lesser payload (#4).
[x] Time graph, which is a feature to draw a graph to visualize time spent in Duolingo (#5).
[x] Synchronization of essential data (#6).
[x] Visualize number of sessions (lessons/practices/extras) in a graph (#6).
[x] Human-readable time format (XX hours YY minutes) (#7).
[x] Show the login/authentication method to the user (#8).
[x] Separate the methods for logging in and fetching the user's data (#9).
[x] Diagram and development guidelines (#10).
[x] Simplify synchronization, part of #11 (#12).

lauslim12 / japanese-duolingo-visualizer