Haar Cascade Face detection notebook example

[tusharparimi]

Work done

• This is a sub issue pull request for Notebook Examples #78
• I have added a jupyter notebook example for Haar Cascade face detection

Need Help on

• An additional gitignore commit was made to ignore some egg-info directories that were created which seem to be something related to older python project versioning.
• I gitignored these folders for now as I did not have a clue what these meant and if they are useful for this project. I saw that current 2.0 branch does not have these folders.