Add some PineTime logos for anyone to use

[geky]

@lupyuen, let me know if there's any issues with these.

Any resemblance to real logos or other real-life entities is purely coincidental. All symbols and other entities appearing in these works are fictitious. Any resemblance to real logos, dead or alive, or other real-life entities, past or present, is purely coincidental.

[lupyuen]

Thanks! :-)