Add some examples

[rafi0]

Hi, it would be useful to see some simple examples of code and maybe visual(if possible) results in the README file.

[OfflineBrain]

Thank you for feedback! I'll add better showcase when get more time to do it properly.
Meanwhile you can take a look on simple example with korge, drawing on bitmap and input-to-hex conversion: https://github.com/OfflineBrain/khexagon/tree/examples/examples/khexagon-korge