feat: playground add submenu

src/utils/excel-reader.ts

@@ -0,0 +1,16 @@
+import XLSX from 'xlsx';
+
+export default function readExcelContent(file: File): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = function (e: any) {
+      const arrayBuffer = e.target.result;
+      const workbook = XLSX.read(arrayBuffer, { type: 'string' });
+      const ws = workbook.Sheets[workbook.SheetNames[0]]; // get the first worksheet
+      const data = XLSX.utils.sheet_to_json(ws);
+      resolve(JSON.stringify(data));
+    };
+    reader.onerror = (error) => reject(error);
+    reader.readAsArrayBuffer(file);
+  });
+}