Added pattern.css to projects

[bansal]

Please confirm this pull request meets the following requirements:

• [x] I followed the contributing guidelines: https://github.com/github/india/blob/main/CONTRIBUTING.md.

Which change are you proposing?

• [x] Adding/updating open source project/s
• [ ] Adding/updating maintainer/s

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Adding/updating open source project/s

• [x] The project was built in or receives significant contributions from India
• [x] The project has at least 100 stargazers

Why should this open source project be featured?

Please replace this line with an explanation of why you think these changes should be made.

Adding/updating maintainer/s

• [ ] Maintainer's location on their GitHub profile indicates as India
• [ ] Maintainer has approved this PR to be included on the website

What open source project/s does the individual maintain?

Please replace this line with GitHub URLs to projects that the individual/s maintains

Something that does not neatly fit into the binary options above

• [ ] My suggested edits are not about an existing page, or at least not a single one

Please replace this line with an explanation of your proposed changes.

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