Add CMakeLists.txt for easy build with cmake.

[Skeeve]

Hi Steffen.

I think I deleted the last pull request by accident, so I try it again.

Feel free to adopt this CMakeLists.txt to be able to use cmake to build.

This will then allow others to use my SDK Docker Image to build the binary.

Hope you find it useful.

[Skeeve]

I just enhance it a bit so that building your own binary without "polluting" your system with all the dependencies. is even easier.