[readme.md] Update readme

- No Logic touched, no code changes, just the readme.
- Add Agile Statistics Graphs to the readme to reflect work being done.
- Add Agile Kanban to the readme of working tickets.

Repo owners can login with GitHub on https://waffle.io to customize the Kanban if want (its auto-generated from tickets, free service for open source just like github)  :octopus: