[readme.md] Update readme

- No Logic touched, no code changes, just the readme.
- Update readme, better indentation and spacing.
- Add more useful Links to the terms on the readme.
- Add commands to git clone the repo to contribute.
- Add Agile Statistics Graphs to the readme to reflect work being done.

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: