feat: gridfs save file

client/package.json

@@ -37,6 +37,7 @@
     "mammoth": "^1.5.1",
     "mermaid": "^10.2.3",
     "mongoose": "^6.10.0",
+    "multer": "1.4.5-lts.1",
     "nanoid": "^4.0.1",
     "next": "13.1.6",
     "next-i18next": "^13.3.0",
@@ -72,6 +73,7 @@
     "@types/jsdom": "^21.1.1",
     "@types/jsonwebtoken": "^9.0.1",
     "@types/lodash": "^4.14.191",
+    "@types/multer": "^1.4.7",
     "@types/node": "18.14.0",
     "@types/papaparse": "^5.3.7",
     "@types/pg": "^8.6.6",