Mention the app template on the website

Author: jwharm

docs/index.md

@@ -42,6 +42,8 @@ JAR files with the Javadoc and source code, to use offline in your IDE, are avai
 
 You can find example applications in the [java-gi-examples repository](https://github.com/jwharm/java-gi-examples).
 
+There's also a "Java-GI application template application" complete with functioning translations, settings, icons, Flatpak build manifest and everything else required for a typical GNOME application in the [java-gi-app-template repository](https://github.com/jwharm/java-gi-app-template).
+
 ## Contributing
 
 To build Java-GI for yourself, make changes, or use Java-GI to generate bindings for other (GObject-Introspection based) libraries, follow the instructions [here](https://jwharm.github.io/java-gi/generate/). Please log issues, questions and requests on [Github](https://github.com/jwharm/java-gi), or join the discussion on [Matrix](https://matrix.to/#/#java-gi:matrix.org).