adds read me and license

README.md

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+# Suppress GCal Alerts
+
+A minimal Chrome extension that silences `window.alert()` calls on Google Calendar.
+
+## Files
+
+- `manifest.json` — extension configuration
+- `background.js` — registers the content script into the page's main JS context
+- `suppress.js` — overrides `window.alert` with a no-op
+
+## Installation
+
+1. Clone or download this folder.
+2. Go to `chrome://extensions` and enable Developer mode.
+3. Click "Load unpacked" and select this folder.
+
+## Notes
+
+The script must run in the `MAIN` world (the page's own JS context) to override `window.alert` effectively. Declaring `world: "MAIN"` in `manifest.json` has a known Chrome bug and does not work reliably, so the content script is registered programmatically from the service worker instead.