React webpart to manage bookmarks

[sudeepghatak]

By submitting this pull request, you agree to the contribution guidelines

If you aren't familiar with how to contribute to open-source repositories using GitHub, or if you find the instructions on this page confusing, sign up for one of our Sharing is Caring events. It's completely free, and we'll guide you through the process.

To submit a pull request with multiple authors, make sure that at least one commit is a co-authored commit by adding a Co-authored-by: trailer to the commit's message. E.g.: Co-authored-by: name <[email protected]>

Put an x in all the items that apply ([x], no spaces between the [, the x, and the ] ), make notes next to any that haven't been addressed.

• New sample
• Bug fix/update
• Related issues: fixes #X, partially #Y, mentioned in #Z

What's in this Pull Request?

The 'Bookmarks Manager' web part allows users to manage and organize bookmarks in a SharePoint list. Users can add, edit, and delete bookmarks, which are displayed in a grid layout. The web part supports both light and dark themes and integrates seamlessly with SharePoint.

Node Version

Node version used: 18.20.6

Checklist

• [ X] My pull request affects only ONE sample.
• [X ] My sample builds without any warnings
• [ X] I have updated the README.md file's Version history. For new samples, created a new README.md file matching this template
• [ X] My README.md has at least one static high-resolution screenshot (i.e. not a GIF) located in the assets folder.
• [ X] My README.md contains complete setup instructions, including pre-requisites and permissions required
• [ X] My solution includes a .nvmrc file indicating the version of Node.js