README.md: Either disclaim responsibility for or provide compilation instructions.

An observation: 20 out of 77 open issues in this project are about compiling. (>25%)

I myself spent an entire day just to figure out I actually absolutely need the specific version of MinGW that is `MingW-w64` to be able to build the example projects on Windows x64. Even though it works now, there are some confusing options in the setup (POSIX vs. win32 threads and SEH vs. SJLJ vs. DWARF Exception Handling) which are unique to the C world. I am now already struggling with the next issue which is building a 32 bit executable on a 64 bit Windows.

The real problem here is that there is no indication in the README.md that despite this being a Golang project, extensive C knowledge is required to use it.
The README.md should do one of the following:
1) Disclaim responsibility for providing compilation instructions and explain that C knowledge is required.
2) Hand-hold users through the compilation process for at least native compilation on every OS/Arch combination.