updated readme
updated readme

cornerstonejs/cornerstoneTools,google/cornerstoneTools,google/cornerstoneTools,HorizonPlatform/cornerstoneTools,cornerstonejs/cornerstoneTools,HorizonPlatform/cornerstoneTools,leonardorame/cornerstoneTools,jmhmd/cornerstoneTools,leonardorame/cornerstoneTools,swederik/cornerstoneTools,chafey/cornerstoneTools,swederik/cornerstoneTools,cornerstonejs/cornerstoneTools,jmhmd/cornerstoneTools