Add a description, image, and links to the groove-machine-tutorial topic page so that developers can more easily learn about it.

Add a description, image, and links to the gms-groove-machine-synth-tutorial topic page so that developers can more easily learn about it.

<iframe width="100%" height="340" class="ent-evideo-embed" src="http://www.gmanetwork.com/entertainment/evideo/mars-pa-more-groove-with-rayver-cruz-sa-dont-go-yet ...