Tree Chart Component - react-charting - Update README

[Apurva-tech]

Verified that:

• Code is up-to-date with the master branch
• Your changes are covered by tests (if possible)
• You've run yarn change locally

Update readme

[fabricteam]

📊 Bundle size report

_{🤖 This report was generated against 640408c5aef9c3037f5f6bc08069ff9d9141a7ee}

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit bc7eb9a:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 640408c5aef9c3037f5f6bc08069ff9d9141a7ee (build)