Added Human Detection and Counting in Computer Vision

[akash-rajak]

Related Issue

• Info about the related issue

• [x] Hacktoberfest2021 Participant

• [ ] Contributor

Closes: #191

Describe the changes you've made

Added human detection and counting application in computer vision.

Type of change

What sort of change have you made:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Code style update (formatting, local variables)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Describe how have you verified the changes made

Checklist:

• [x] My code follows the guidelines of this project.
• [x] I have performed a self-review of my own code.
• [ x] I have commented my code, particularly whereever it was hard to understand.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.

• [x] I have added test cases that prove my fix is effective or that my feature works.

  Screenshots:

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