add kitt.py to examples

[MisterZeus]

an attempt at a simple and accurate homage to the KITT smart car :-)

[coveralls]

Pull Request Test Coverage Report for Build 1769520375

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 74.026%

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Totals
Change from base Build 799146889:	0.0%
Covered Lines:	57
Relevant Lines:	77

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💛 - Coveralls

[Gadgetoid]

Thank you. This achieves a similar thing to the larson scanner example (https://github.com/pimoroni/blinkt/blob/master/examples/larson.py), but it's different enough to be interesting.

[MisterZeus]

Thanks Gadgetoid, I was inspired by the larson lights, and wanted to try coding the specific KITT effect by myself as a learning exercise. Tried to code an array approach, but had an aha moment with the decay idea :-)