added about.html

[iamsonukushwaha]

Description

added about.html

Fixes # (issue) #135

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have added all the three reviewers: @vinitshahdeo, @kashish121 & @ishika1727

[iamsonukushwaha]

@vinitshahdeo please add Labels to it