Update README.md for spinning an etcd-v2 cluster

Author: alaypatel07

README.md

@@ -1,2 +1,11 @@
 # etcd-dev-tools
 This repository has tools to make etcd development and debugging easy.
+
+### Spin a etcd v2 cluster
+
+1. Install docker-compose and clone the repo.
+2. `cd etcd-dev-tools/etcd-v2`
+3. Bring up the cluster by `docker-compose up -d`
+4. Access the cluster:
+    1. Get client shell: `docker exec -it etcd-v2_etcd-client_1 sh`
+    2. Run etcdctl commands in the container: `etcdctl member list`