Add location-based tutorial

[nickw1]

Description

This PR adds a tutorial for the geolocation part of RDK.

It starts with a Hello World, which simply displays a red box to the north of you, and then progresses to contacting a simple API, retrieving POIs from a database, and retrieving lines (roads or paths) from the database and rendering them as GeoLines.

If this looks OK, I plan on extending the tutorial to cover downloading and caching tile-based geodata with the locar-tiler package, and accounting for elevation.

Test Steps

Try out the tutorial and check it works.

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[coopbri]

@nickw1 will circle back to this this week or weekend

[nickw1]

@coopbri sounds good. As it happens I'm also refactoring LocAR somewhat, wrapping a lot of the startup boilerplate code into an App class which should hopefully potentially provide the opportunity to simplify the LocAR code in RDK.

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commit: 3c3041a

[coopbri]

This is great material. Would love to get this on our official docs site with your name on it. Could you open it in https://github.com/omnidotdev/docs under content/docs/reality/?

Thanks for your awesome LocAR updates and for the great docs contributions here!

[nickw1]

@coopbri many thanks! Will open under docs as you suggest. Closing here for now but will re-open.