Create Exercises_5.cpp

[jsxyhelu]

Create Exercises of chapter 5

[jsxyhelu]

wait for permit.

[garybradski]

This is generally good. I prefer a little "void help(char** argv) function that tells what each function does when it runs. See, for example: example_15-01.cpp.

[garybradski]

See my comment, I prefer a "help function" as in example_15-01.cpp https://github.com/oreillymedia/Learning-OpenCV-3_examples/blob/master/example_15-01.cpp but this is acceptable now. Thanks!

[jsxyhelu]

Great. I'll keep improving。