add horizontal direction for example

[senseiphoneX]

Hi, I'm japanese engineer. Thanks beautiful date picker. I'm trying add Horizontal Direction.

Sorry, I don't know how to fix library. I fixed example. For now, I'd like you to check if the lateral movement is a good plan.

Thanks.

[di2pra]

Hey @senseiphoneX great idea! Let me make the DatePicker more customizable and add your feature.

Thanks for contributing!!