add readme file

Author: jmathianas

README.md

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+# Running existing images on OpenShift
+
+## Description
+
+This demonstrates running an existing spring boot example application docker image hosted on quay.io
+
+## Docker Command Example
+```
+docker run -p 8080:8080 quay.io/cloudfirst/spring-boot-helloworld:v0.2
+```
+
+## OpenShift Command Example
+Run the following command to run the docker image and then expose the port
+```
+oc new-app quay.io/cloudfirst/spring-boot-helloworld:v0.2
+oc expose svc/spring-boot-helloworld
+```
+
+Run the following to get the route url
+```
+oc get route spring-boot-helloworld --template="http://{{ .spec.host }}"
+```