Added bills upload & list

util/generateUniqueFilename.ts

@@ -0,0 +1,7 @@
+import path from "path";
+
+export default function (file: Express.Multer.File) {
+  return `${file.originalname}-${Math.floor(Date.now() / 1000)}${path.extname(
+    file.originalname
+  )}`;
+}