Adding Roadmap / TODO in README.md
Adding Roadmap / TODO in README.md

* Putting plans into shared artifacts helps people get on the same page
* Also some small formatting fixups

victoria-valdes/edx-certificates,appsembler/edx-certificates,cecep-edu/edx-certificates,ESOedX/edx-certificates,eestay/edx-certificates,EDUlib/edx-certificates,eestay/edx-certificates,marcore/edx-certificates,Stanford-Online/openedx-certificates,stvstnfrd/edx-certificates,Stanford-Online/openedx-certificates,edx/edx-certificates,olexiim/edx-certificates,olexiim/edx-certificates,victoria-valdes/edx-certificates,EDUlib/edx-certificates,edx/edx-certificates,marcore/edx-certificates,stvstnfrd/edx-certificates,cecep-edu/edx-certificates,ESOedX/edx-certificates,appsembler/edx-certificates