Add more detailed overview in `README.md`

[maxachis]

Basically, if I were a dev, how would I decide if I should be using this?

Additionally, make sure it references the GitHub repo.

Also, add the fun little repository tiles.

[maxachis]

To put in the README (perhaps with some rewording):

It automatically handles authentication and facilitates making requests to the PDAP client. So it handles login, stores the access and refresh tokens, and automatically refreshes where needed