The commands/programs in /bin are not non-readable, but they are, as you say, compiled. This means that they were originally written in C (or some other programming language) and have been compiled to machine code (binary) so the processor can execute the code. To do the same, simply write the program you need in C and run the gcc command to produce an executable file.

To print any human readable text in a files use strings < /bin/file,