Add BME680 demo app

Demo App which shows Temperature, Humidity and Pressure. Updates every 10 secs.

Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

changed milestone to %v1.4

There appeared an egg for this topic: https://badge.team/projects/temp, so feel free to cancel this MR. I suggest to include the other egg as preloaded app, as it nicely showcases the capabilities of card10.

LGTM

merged

mentioned in commit e08ab5df