Add configuration options to README.md
Add configuration options to README.md

Reviewed By: rbalicki2

Differential Revision: D32699562

fbshipit-source-id: f69d04c3f12fc8aa9d9d75151a12d5d8b4aa9fcb

wincent/relay,voideanvalue/relay,xuorig/relay,voideanvalue/relay,josephsavona/relay,facebook/relay,josephsavona/relay,facebook/relay,kassens/relay,kassens/relay,kassens/relay,voideanvalue/relay,xuorig/relay,xuorig/relay,wincent/relay,facebook/relay,xuorig/relay,voideanvalue/relay,wincent/relay,josephsavona/relay,voideanvalue/relay,wincent/relay,facebook/relay,kassens/relay,facebook/relay,wincent/relay,xuorig/relay,xuorig/relay,kassens/relay,wincent/relay,voideanvalue/relay,facebook/relay,kassens/relay