Move examples to subfolder

[ramboerik]

Hi,

I'm using this library with build system platformIO and stumbled over a minor problem. platformIO supports external git dependencies and manages the download/compile all by itself but the problem is that it compiles all sources in the root of the repo. example.x.cpp and example11.x.cpp get compiled and I get an error for multiple definitions of main() . Could you move the examples to a separate folder, e. g. examples/ ? This would make the library perfect compatible with platformIO!

[quicknir]

Sure, make a pull request and I'll merge it.