Describe how to compile these code.

Show how to compile the source code. I will also comply with this rule in the future.
Update README.md
1. Support unicode coding successfully. I have test it simply in chinese coding.
2. You can compile it with command below:
gcc -O3 -Iclips -Iunicode clips/*.c unicode/*.c -o clips.out

I will complete some samples as soon as possible
Update README.md
Update README.md