Add build badge to README
Add build badge to README

stuartleeks/nether,oliviak/nether,ankodu/nether,krist00fer/nether,brentstineman/nether,navalev/nether,ankodu/nether,MicrosoftDX/nether,navalev/nether,brentstineman/nether,stuartleeks/nether,vflorusso/nether,stuartleeks/nether,brentstineman/nether,navalev/nether,navalev/nether,stuartleeks/nether,ankodu/nether,brentstineman/nether,vflorusso/nether,brentstineman/nether,stuartleeks/nether,vflorusso/nether,vflorusso/nether,ankodu/nether,vflorusso/nether