Add README with install instructions and skill descriptions

Author: jsturtevant

README.md

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+# Copilot Skills
+
+Agent skills for GitHub Copilot CLI that implement the **CodeAct pattern** — collapse multi-step tool chains into a single sandboxed Python execution.
+
+## Install
+
+```bash
+# Install a specific skill
+gh skill install jsturtevant/copilot-skills monty-codeact
+gh skill install jsturtevant/copilot-skills hyperlight-codeact
+
+# Or browse and choose interactively
+gh skill install jsturtevant/copilot-skills
+```
+
+Then `/skills reload` in Copilot CLI to pick them up.
+
+## Available Skills
+
+### monty-codeact
+
+**CodeAct with [Pydantic Monty](https://github.com/pydantic/monty)** — a minimal, secure Python interpreter written in Rust.
+
+- Sub-microsecond startup (<1μs)
+- Tools called as natural Python functions: `view(path="README.md")`
+- Lightweight: `pip install pydantic-monty` (~4.5MB)
+- Auto-installs dependencies via `uv` if missing
+
+Best for: fast, lightweight tool chaining where full Python isn't needed.
+
+### hyperlight-codeact
+
+**CodeAct with [Hyperlight](https://github.com/hyperlight-dev/hyperlight)** — micro-VM sandbox using WebAssembly.
+
+- Full CPython runtime inside a Wasm sandbox
+- Tools called via `call_tool("view", path="README.md")`
+- Stronger isolation (separate micro-VM per execution)
+- Auto-installs dependencies via `uv` if missing
+
+Best for: when you need full Python support or stronger sandbox isolation.
+
+### Shared features
+
+Both skills discover and register tools that match **Copilot CLI built-in tool names**:
+
+| Copilot CLI tool | Sandbox function | What it does |
+|---|---|---|
+| `view` | `view()` / `call_tool("view")` | Read files / list directories |
+| `create` | `create()` / `call_tool("create")` | Create new files |
+| `edit` | `edit()` / `call_tool("edit")` | Surgical string replacement |
+| `glob` | `glob()` / `call_tool("glob")` | Find files by pattern |
+| `grep` | `grep()` / `call_tool("grep")` | Search file contents (needs `rg`) |
+| `bash` | `bash()` / `call_tool("bash")` | Run shell commands |
+| `sql` | `sql()` / `call_tool("sql")` | SQLite queries |
+| `web_fetch` | `web_fetch()` / `call_tool("web_fetch")` | Fetch URLs (needs `curl`) |
+| `github_api` | `github_api()` / `call_tool("github_api")` | GitHub REST API (needs `gh`) |
+
+## Why CodeAct?
+
+Instead of N individual tool calls (model → tool → model → tool …), the agent writes one Python program that chains all the tools together and runs it in a single turn. This cuts latency by ~50% and token usage by 85%+ for multi-step tasks.
+
+For more on the pattern, see [CodeAct with Hyperlight](https://devblogs.microsoft.com/agent-framework/codeact-with-hyperlight/) from Microsoft.
+
+## License
+
+MIT