docs: add vscode web button in readme

[Ragini-Microsoft]

Purpose

This pull request updates the README.md to add a new quick-launch option for opening the project in Visual Studio Code Web, alongside the existing GitHub Codespaces and Dev Containers options.

Improvements to developer experience:

• Added a badge and link for opening the project directly in Visual Studio Code Web, making it easier for users to get started without local setup.
• Updated the markdown table to include the new Visual Studio Code Web option and adjusted the table formatting accordingly.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information