add demo

examples/.eslintrc.cjs

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+/* eslint-env node */
+
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+  },
+  extends: ['../.eslintrc.cjs'],
+};

examples/README.md

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+# Examples
+
+These example scripts can be run in any JavaScript runtime that supports the prerequisites mentioned in the `README.md` in the repo root. Here's how to run one example using Node, Deno, or Bun:
+
+```sh
+# For the example named "basic.js":
+node basic.js
+deno run basic.js
+bun basic.js
+```

examples/basic.js

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+import { Event, EventTarget } from '../src/index.js';
+
+const eventTarget = new EventTarget();
+const event = new Event('click', {});
+eventTarget.addEventListener('click', (event) => {
+  console.log(`Fired "${event.type}" event!`, event);
+});
+eventTarget.dispatchEvent(event, 'abc');