#36 Added about us section

[Srijita-Mandal]

Fixes Issue

This PR fixes the following issues:

Added About Us section in the home page with dummy (relevant) contents and responsive UI, as per issue #36

Added about us section with 3 sub-sections- Welcome, Key takeaways and top services.

Added relevant contents.

Made responsive UI.

Here comes all the changes proposed through this PR

Check List (Check all the boxes which are applicable)

• [ x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x ] All new and existing tests passed.
• [x ] This PR does not contain plagiarized content.
• [x ] The title of my pull request is a short description of the requested changes.

Screenshots

Add all the screenshots which support your changes

https://user-images.githubusercontent.com/84610348/155270653-dac1c7db-ee7a-4ea7-88f5-e8fbee1ea4e0.mp4

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