Add DS Vision skill

[Chenyang Wang (Sorwcyra)]

Adds DS Vision Skill to the Document Processing category.

Problem solved:

• Gives text-first agents a vision gateway for screenshots, images, OCR tasks, and PDF/document parsing.

Who uses this workflow:

• Claude Code, Codex, Cursor, Gemini CLI, and other agent users who need structured visual input handling.

Attribution:

• Skill by Chenyang Wang (@Sorwcyra): https://github.com/Sorwcyra/ds-vision-skill

Example usage:

• Route an image, screenshot, scan, or PDF through the skill and return a structured JSON result for the main model to reason over.

Validation:

• Confirmed the public skill repository is reachable.
• Updated only README.md with one catalog entry.