docs: Update README with development instructions for Chrome extension

Author: neo773

apps/loom-importer-extension/README.md

@@ -13,3 +13,7 @@ This is a Chrome extension that allows you to import your Loom videos into Cap.
 │       └── popup.tsx # Popup for the extension (shown when the extension is clicked)
 └── vite.config.ts
 ```
+
+## Development
+
+Go to chrome://extensions/ and click "Load unpacked" and select the `dist` folder.