Add Janus Studio to Visualization section

[Zorabi]

Fixes #4943.

Adds Janus Studio to the third-party tools listed in the root README Visualization section.

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For all changes:

• An issue is associated with this PR and referenced in the commit message.
• The PR body references Add Janus Studio to the Visualization section #4943.
• The branch is based on the latest upstream master.
• The contribution is a single, squashed commit.

For code changes:

• Not applicable; this is a documentation-only change with no code or dependency changes.

For documentation related changes:

• The new entry follows the existing alphabetical list and Markdown format.

[linux-foundation-easycla]

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• ✅ login: Zorabi / name: dongx (5f897a7)