Benchmark beta
Add Benchmark

#	Hashrate	1 thread	Size	Duration	CPU	Threads	Version
1	13901.90	434.43	10MH	719.326	2	32	6.7.2
2	13864.05	433.25	1MH	72.129	2	32	6.8.0
3	13863.86	433.25	1MH	72.130	2	32	6.8.0
4	10396.74	324.90	1MH	96.184	2	32	6.8.0