Update README

frontend/packages/cli/README.md

@@ -1 +1,62 @@
 # @liam/cli
+
+`liam-cli` is a command-line tool designed to generate a web application that displays ER diagrams.
+
+```bash
+$ liam-cli build --input {your .sql}
+# Outputs the web application to the ./public and ./dist directories
+
+$ liam-cli preview
+# Launches the web application for preview
+```
+
+## Building and Installing the Standalone CLI for Development
+
+To build the CLI for development purposes, run:
+
+```bash
+pnpm run build:cli
+# The executable will be output to dist-cli/bin/cli.js.
+```
+
+After building, you can invoke it locally with:
+
+```bash
+node ./dist-cli/bin/cli.js build --input ./fixtures/input.sql
+```
+
+To make it globally accessible as `liam-cli`, use:
+
+```bash
+pnpm link --global
+```
+
+## Explanation of npm Scripts for Development
+
+### Commands
+
+1. **Build**
+   ```bash
+   pnpm run build
+   ```
+   - Internally, `./fixtures/input.sql` is passed as the `build --input` argument.
+   - Runs Vite's build process.
+
+2. **Dev**
+   ```bash
+   pnpm run dev
+   ```
+   - Internally, `./fixtures/input.sql` is passed as the `dev --input` argument.
+   - Starts the Vite development server.
+
+3. **Preview**
+   ```bash
+   pnpm run preview
+   ```
+   - Previews the production build using Vite's built-in preview functionality.
+
+## File Structure
+
+- **bin/cli.ts**: The main CLI script.
+- **fixtures/input.sql**: A sample `.sql` file for testing purposes.
+- **src/**: The web application that displays ER diagrams.