Add plugin manifest for awesome-copilot marketplace

.github/plugin/plugin.json

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+{
+  "name": "whatidid",
+  "description": "Turn your Copilot sessions into proof of impact — research-grounded HTML reports with effort estimation, skills analysis, and ROI metrics from local session logs.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Microsoft",
+    "url": "https://www.microsoft.com"
+  },
+  "repository": "https://github.com/microsoft/What-I-Did-Copilot",
+  "license": "MIT",
+  "keywords": ["copilot", "productivity", "impact", "report", "estimation", "roi", "session-logs"],
+  "agents": [".github/agents/whatidid.agent.md"],
+  "skills": ["skills/whatidid/"]
+}

skills/whatidid/SKILL.md

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+---
+name: whatidid
+description: "Generate a branded HTML impact report showing what GitHub Copilot helped you accomplish — goals delivered, human effort equivalent, skills augmented, collaboration patterns, and estimation evidence grounded in peer-reviewed research. Works with any Copilot CLI or VS Code agent session."
+---
+
+# What I Did (Copilot)
+
+This is the canonical skill entry for the What-I-Did-Copilot report generator.
+
+Use this skill to turn local GitHub Copilot session logs into a branded HTML impact report that summarizes:
+
+- goals delivered
+- human-effort-equivalent estimates
+- skills augmented
+- collaboration patterns
+- estimation evidence grounded in the project's research methodology
+
+The tool works with Copilot CLI and VS Code agent sessions and keeps data local-first.
+
+For full setup, workflow, and methodology, see [README.md](../../README.md) and [effort-estimation-methodology.md](../../docs/effort-estimation-methodology.md).