Add OSPO Sponsorship collection and plugin for sponsor-finder skill

Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

plugins/ospo-sponsorship/.github/plugin/plugin.json

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+{
+  "name": "ospo-sponsorship",
+  "description": "Tools and resources for Open Source Program Offices (OSPOs) to identify, evaluate, and manage sponsorship of open source dependencies through GitHub Sponsors, Open Collective, and other funding platforms.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Awesome Copilot Community"
+  },
+  "repository": "https://github.com/github/awesome-copilot",
+  "license": "MIT"
+}

plugins/ospo-sponsorship/README.md

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+# Open Source Sponsorship Plugin
+
+Tools and resources for Open Source Program Offices (OSPOs) to identify, evaluate, and manage sponsorship of open source dependencies through GitHub Sponsors, Open Collective, and other funding platforms.
+
+## Installation
+
+```bash
+# Using Copilot CLI
+copilot plugin install ospo-sponsorship@awesome-copilot
+```
+
+## What's Included
+
+### Skills
+
+| Skill | Description |
+|-------|-------------|
+| `SKILL.md` | Find which of a GitHub repository's dependencies are sponsorable via GitHub Sponsors. Uses deps.dev API for dependency resolution across npm, PyPI, Cargo, Go, RubyGems, Maven, and NuGet. Checks npm funding metadata, FUNDING.yml files, and web search. Verifies every link. Shows direct and transitive dependencies with OSSF Scorecard health data. Invoke by providing a GitHub owner/repo (e.g. "find sponsorable dependencies in expressjs/express"). |
+
+## Source
+
+This plugin is part of [Awesome Copilot](https://github.com/github/awesome-copilot), a community-driven collection of GitHub Copilot extensions.
+
+## License
+
+MIT

plugins/ospo-sponsorship/skills/sponsor-finder

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+../../../skills/sponsor-finder