Add the assignment to deploy v4 of the demo

[refs #52bc410e062d]

Author: jfahrer

swarm/assignment1.md

@@ -0,0 +1,16 @@
+## Deploy a demo application
+* Create an overlay network
+* Create a service for jfahrer/swarm-demo-frontend:v4
+  * Call it demo-frontend
+  * Attach the service to the overlay network
+* Create a service for jfahrer/swarm-demo-lb:v1
+  * Call it demo-lb
+  * Attach the service to the overlay network
+  * Publish port 80
+  * Set environment variables (--env)
+    * PROXY_UPSTREAM=demo-frontend:8080
+* Use your browser to verify that it works
+  * http://localhost
+* Scale the demo-frontend service to 5 replicas
+* Update the demo-frontend service to use jfahrer/swarm-demo-frontend:v3
+  * rollback