Benchmark beta
Add Benchmark

#	Hashrate	1 thread	Size	Duration	CPU	Threads	Version
1	6419.39	267.47	1MH	155.778	1	24	6.21.3
2	6350.17	264.59	1MH	157.476	1	24	6.21.1
3	4932.91	205.54	1MH	202.720	1	24	6.21.0