Add blur_faces function

Add a script which the blur human faces on the photo. Just enter path to the main photo. Requirements and README.md files added

Checklist:

[+] My code follows the style guidelines(Clean Code) of this project
[+] I have performed a self-review of my own code
[+] I have commented my code, particularly in hard-to-understand areas
[+] I have created a helpful and easy to understand README.md
[+] I have made corresponding changes to the documentation
[+] My changes generate no new warnings
[+] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works