readme improvement
readme improvement

MichaelJY91/concurrentunit,advanced-programs/concurrentunit,flowersinthesand/concurrentunit,yodasantu/concurrentunit,yodasantu/concurrentunit,jhalterman/concurrentunit,advanced-programs/concurrentunit,flowersinthesand/concurrentunit,jhalterman/concurrentunit,MichaelJY91/concurrentunit