Create README.md

Author: collabnix

intermediate/swarm/rexray/README.md

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+# Setting up Persistent Storage for Docker Swarm using Rexray on Google CLoud Platform
+
+## Pre-requisite
+
+- Google Cloud Platform
+- 3-Node Docker Swarm Cluster(1 Manager + 2 Worker Nodes)
+- Enable Full Access to All Cloud API
+
+## Ensure that you have 3-Node Docker Swarm Cluster
+
+```
+docker node ls
+```
+
+## Ensure that Docker Compose is installed on the Manager Node
+
+## Setting up Visualizer Tool
+
+```
+git clone https://github.com/collabnix/dockerlabs
+cd dockerlabs/solution/viz
+docker-compose up -d
+```
+
+Access Visualizer tool via http://<IP>:8080
+
+## Installing RexRay Plugin
+
+```
+sudo docker plugin install --grant-all-permissions rexray/gcepd GCEPD_TAG=rexray
+
+dockercaptain1981@node1:~/dockerlabs/solution/viz$ sudo docker plugin install --grant-all-permissions rexray/gcepd GCEPD_TAG=rexray
+latest: Pulling from rexray/gcepd
+fa408a4c04c6: Download complete 
+Digest: sha256:d3f6a92d013abb9a66ec7d7d786bd66ce7b5f04c7ceeb2dac700b370582a
+2a2f
+Status: Downloaded newer image for rexray/gcepd:latest
+Installed plugin rexray/gcepd
+```
+
+# Listing the RexRay Plugin
+
+
+```
+$ sudo docker plugin ls
+ID                  NAME                  DESCRIPTION                      
+  ENABLED
+9d636b335dd0        rexray/gcepd:latest   REX-Ray for GCE Persistent Disks 
+  true
+dockercaptain1981@node1:~/dockerlabs/solution/viz$ 
+```
+