Documentation for tips on adding new watch face

[bmsleight]

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Add Documentation for tips on adding new watch face

Description

PR to follow Useful way to start hacking a new watch face.

[kieranc]

There's a wiki page here: https://wiki.pine64.org/wiki/PineTime_Custom_Watchface_Tutorial It might be somewhat out of date, I'll try and scan through it to see, and maybe add it to the new docs repo. edit: it is quite outdated sadly and will need some work to bring it up to date.

[margamanterola]

I recently went through the process of adding a new face. All documentation online is currently so outdated, that it might be better to not have it at all, as it's super misleading.