Modified readme

README.md

@@ -1,3 +1,16 @@
+#Install
+
+Download the whl file (in azext_vmware_cs directory)
+
+```
+whl=vmware_cs-0.1.0-py2.py3-none-any.whl
+az extension add --source $whl -y
+```
+
+#Usage
+```
+az vmware -h
+```
 
 # Contributing