chore: add watch scripts.

scripts/watch.mjs

@@ -0,0 +1,19 @@
+import path from 'path';
+import chokidar from 'chokidar';
+import { getStat } from 'recursive-readdir-files';
+import { run, DOCS, createHTML } from './index.mjs';
+
+;(async () => {
+  await run();
+  const homeMdPath = path.relative(process.cwd(), 'README.md')
+  const watcher = chokidar.watch([DOCS, homeMdPath], {
+    ignored: /(^|[\/\\])\../, // ignore dotfiles
+    persistent: true
+  });
+
+  watcher.on('change', async (path) => {
+    const stats = await getStat(path)
+    createHTML([stats]);
+  })
+  .on('error', error => console.log(`Watcher error: ${error}`))
+})();