docs: add README and CHANGELOG

CHANGELOG.md

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+# Change Log
+
+## [0.1.0] - 2026-07-11
+
+### Added
+
+- Command: Copy AI Context — Selection (copy selected code with file path, line, and column numbers)
+- Command: Copy AI Context — Active File (copy entire active file with file path)
+- Command: Copy AI Context — Workspace Files (pick files from workspace dialog to copy)
+- Command: Copy AI Context — Selected Files (multi-select files in explorer to copy)
+- Output format optimized for AI assistants: `[path LnCn-LnCn]` + code blocks
+- Status bar feedback on copy

README.md

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+# Copy AI Context
+
+A VS Code extension to copy code context formatted for AI assistants (Claude, ChatGPT, pi agent, etc.).
+
+## Features
+
+- **Copy Selection** (`Ctrl+Alt+C` / `Cmd+Alt+C`) — Copy selected code with file path, line, and column numbers
+- **Copy Active File** (`Ctrl+Alt+F` / `Cmd+Alt+F`) — Copy the entire active file
+- **Copy Workspace Files** — Pick files from the workspace to copy as context
+- **Copy Selected Files** — Select multiple files in the explorer and copy their contents
+
+## Output Format
+
+```
+[src/file.ts L10C1-L25C30]
+```typescript
+// your code here
+```
+```
+
+## Requirements
+
+- VS Code 1.85+
+
+## Development
+
+```bash
+npm install
+npm run build
+```
+
+Press `F5` in VS Code to launch a development extension host.
+
+## Changes
+
+See [CHANGELOG.md](CHANGELOG.md).