Add Create a Mojolicious app with Docker

Create-a-Mojolicious-app-with-Docker.md

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+```console
+$ mkdir mojo-app && cd mojo-app
+$ docker run --rm -it -w /opt/app -v $PWD:/opt/app -p 3000:3000 perl:latest bash
+# cpanm --verbose Carton
+# echo "requires 'Mojolicious' => '9.48'," >> cpanfile
+# carton install
+# carton exec -- mojo generate app MojoApp
+# cd mojo_app
+# carton exec -- morbo script/mojo_app
+```
+
+Visit `localhost:3000` in web browser.
+
+```console
+# exit
+$ echo "local" >> .gitignore
+$ git init
+$ git add .
+$ git commit -m "Initial commit"
+```