Add README.md

README.md

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+## mojo-app
+
+An example Mojolicious application.
+
+---
+
+## build docker image
+
+    $ docker build -t mojo_app .
+
+## serve app
+
+    $ docker run --rm -it -p 3000:3000 mojo_app
+
+Visit `localhost:3000` with web browser.
+
+## serve app with local changes
+
+    $ docker run --rm -it -p 3000:3000 -v $PWD:/opt/app mojo_app
+
+Visit `localhost:3000` with web browser. Changes should load when you reload
+the page, without having to restart the server.
+