Add short info about Jenkins to the README
Add short info about Jenkins to the README

cmr/VisualRust,drewet/VisualRust,PistonDevelopers/VisualRust,xilec/VisualRust,tempbottle/VisualRust,vosen/VisualRust,dlsteuer/VisualRust,Boddlnagg/VisualRust,Connorcpu/VisualRust,PistonDevelopers/VisualRust,yacoder/VisualRust,Boddlnagg/VisualRust,Vbif/VisualRust,drewet/VisualRust,vadimcn/VisualRust,dlsteuer/VisualRust,xilec/VisualRust,Muraad/VisualRust,Stitchous/VisualRust,Stitchous/VisualRust,yacoder/VisualRust,tempbottle/VisualRust,Vbif/VisualRust,cmr/VisualRust,vadimcn/VisualRust,Connorcpu/VisualRust,vosen/VisualRust,Muraad/VisualRust