Update README.md

Author: errordeveloper

README.md

@@ -1,3 +1,8 @@
 > NOTICE: The code for weave-kube has been merged into the [Weave
 > Net](https://github.com/weaveworks/weave) repository; if you have
 > any issues, please file them there.
+
+To install Weave on Kubernetes, run:
+```bash
+kubectl apply -f https://git.io/weave-kube
+```