Add overview to README.
Add overview to README.

antonpirker/Rocket,impowski/Rocket,impowski/Rocket,antonpirker/Rocket,shssoichiro/Rocket,antonpirker/Rocket,gsquire/Rocket,gsquire/Rocket,shssoichiro/Rocket,shssoichiro/Rocket,gsquire/Rocket,impowski/Rocket