Add GeoGuess to Games

[BilelJegham]

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[Armanfaryad]

A

[nodiscc]

Related to #2759 (Earthwalker) (100% dependent/is a wrapper around a non-free service). Must decide if these kind of projects should be added to the list (this one is missing the ⚠ symbol, at the very least)

<iframe src="https://maps.google.com" title="my self-hosted application!"></iframe>

[BilelJegham]

Thanks for your review @nodiscc
⚠ added

[nodiscc]

After thinking about it for a while, I don't think we should add it, see comments at #2759.

But I opened an issue at osmlab/awesome-openstreetmap#113 to get it added there instead, and awesome-openstreetmap is linked from https://github.com/awesome-selfhosted/awesome-selfhosted#maps-and-global-positioning-system-gps.