Merge pull request #10 from volcano-sh/kb_readme

Added README about scheduler.

Author: Klaus Ma

pkg/scheduler/README

@@ -0,0 +1,4 @@
+## Volcano Scheduler
+
+Currently, Volcano scheduler duplicated actions/plugins from [kube-batch](https://github.com/kubernetes-sigs/kube-batch)
+which focus on batch workload in Kubernetes. Expect the framework part of kube-batch can be migrated to the upstream.