The (so far) insufficient documentation for Material Design / components says this 

> 
> To try out the MDC Catalog app, you can either run the catalog module
>  in Android Studio or run the following Gradle command:
>  ./gradlew :catalog:installDebug
> 
> 
> 

However, I can ont find the "catalog module" in Android Studio, nor am I sure where to run that Gradle command. 

Finally, there is no catalog app in GitHub for Android although there is a "catalog app" for the web components.