Add the assignment

[refs #786d4353349f]

Author: jfahrer

compose_example/assignment1.md

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+## Integrate the demo_web_app
+* Create the `app.env` file
+  * With the environment variables to configure the `jfahrer/demo_web_app`
+* Add a new service definition `webapp` to the compose file
+  * Use `jfahrer/demo_web_app:latest`
+  * Use the app.env file
+  * Publish port 9292
+* Start the services using docker-compose
+  * Start the database first
+  * The web app second
+* Use your browser to verify it works
+  * http://localhost:9292