add express and webpack-dev-middleware

visualdl/frontend/package.json

@@ -17,6 +17,7 @@
   },
   "dependencies": {
     "axios": "^0.16.1",
+    "express": "^4.16.2",
     "file-saver": "^1.3.3",
     "lodash": "^4.17.4",
     "normalize.css": "^6.0.0",
@@ -25,6 +26,7 @@
     "san-router": "^1.1.1",
     "san-store": "^1.0.1",
     "san-update": "^2.1.0",
+    "webpack-dev-middleware": "^1.12.1",
     "xlsx": "^0.11.3"
   },
   "devDependencies": {