Updated README.md file and added content in Code of conduct.md file

[purnima2904]

What does this PR do?

• Added content in CODE_OF_CONDUCT.md file

In README.md file:

• I have created a table of contents
• added a repository stats table
• added a featured in section
• improved tech stack section
• added stargazers and forkers section
• added website preview and direct link of website
• added a back to top button

Fixes #260

Type of change

• This change requires a documentation update

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

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🎉 Thank you @purnima2904 for your contribution! Your pull request has been submitted successfully. A maintainer will review it as soon as possible. We appreciate your support in making this project better

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