[Add] Fix Readme

[singodiyashubham87]

Details

The Contributing Guidelines heading in the Readme is having two asterisks(**) in the starting and ending of the text but they are showing as it is instead of markdown style, I want to fix this.

Kindly assign me this issue.

Screenshots

Type of Contribution

• [ ] Update to an existing Animated Button
• [ ] Adding a new Button
• [ ] Resolving a bug
• [ ] Proposal to the Repository
• [X] Changes related to documentation or README.md
• [ ] Other Changes

Checklist

• [X] I have checked the existing issues
• [X] I have read the Contributing Guidelines
• [X] I am willing to work on this issue
• [ ] I am a GSSoC'23 contributor