[Tutorial App Customizer] app.json -> metadata.json

[gfwilliams]

Thanks - but please could you leave 'Customiser' in the keywords section? Customizer is already in there and generally in England we use ise rather than ize, so potentially someone may search for Customiser

[thyttan]

Ok, sorry about that! Done!

[gfwilliams]

Thanks! In future, there's no worries about changing the title/etc especially as it matches the app loader better - it's just if someone searches for the old thing it'd be better if they can still find it :)