Compilation instructions are incomplete

[brean]

Hi!

Can you please take a look at the readme and update it ?
I just tried to compile but there is no "buildscript" that I could execute. I managed to get the compiler running using

cd planner/popf && cmake CMakeLists.txt && make -j 8

that created a popf-binary but there is no popf-clp binary to execute.

I could also write this down in a pull request if needed.