Update README.md

Benchmarking Time Analysis:

Processing time for single frame:

158,000 points: avg 17ms, max 57ms, min 4ms

83,000 points: avg 9ms, max 33ms, min 2ms

49,000 points: avg 6ms, max 25ms, min 1ms

22,000 points: avg 2ms, max 16ms, min under 1ms

It should be noted that before implementation optimization on the PointSet class (changing from a list to a hashset), the system could significantly longer (on the magnitude of minutes). Now, the full system takes less than 2 seconds to process an 87 KeyFrame video. 

# Code