Added some more discussion to the README.
Added some more discussion to the README.

cirrus-dev/metrics,valery1707/dropwizard-metrics,kevintvh/metrics,ChetnaChaudhari/metrics,dropwizard/metrics,box/metrics,wfxiang08/metrics,slachiewicz/metrics,mveitas/metrics,gburton1/metrics,gorzell/metrics,slovdahl/metrics,unitsofmeasurement/metrics,mattnelson/metrics,fcrepo4-archive/metrics,signalfx/metrics,mtakaki/metrics,timezra/metrics,gburton1/metrics,box/metrics,mveitas/metrics,egymgmbh/metrics,wickedshimmy/metrics-scala,maciej/metrics-scala,jasw/metrics,scullxbones/metrics-scala,infusionsoft/yammer-metrics,fcrepo4-archive/metrics,chenxianghua2014/metrics,mnuessler/metrics,AltitudeDigital/metrics,ohr/metrics,gorzell/metrics,randomstatistic/metrics,thelastpickle/metrics,ind9/metrics,infusionsoft/yammer-metrics,rexren/metrics,mspiegel/metrics,dropwizard/metrics,Banno/metrics,mt0803/metrics,tempredirect/metrics,jplock/metrics,gorzell/metrics,erikvanoosten/metrics-scala,bentatham/metrics,dropwizard/metrics