Reorganized README.md and added more resources. (#1089)
Reorganized README.md and added more resources. (#1089)

* Reorganized README.md and added more resources.

* Boldened some words and the 'Get started here' link and combined two feature list points into one to improve readability and conciseness.

supergiant/supergiant,supergiant/supergiant,supergiant/supergiant,supergiant/supergiant,supergiant/supergiant