added playlist retrieval route, redis store

package.json

@@ -19,6 +19,7 @@
   "homepage": "https://github.com/20kaushik02/spotify-manager#readme",
   "dependencies": {
     "axios": "^0.27.2",
+    "connect-redis": "^6.1.3",
     "cookie-parser": "^1.4.6",
     "cors": "^2.8.5",
     "dotenv": "^16.0.1",
@@ -27,6 +28,7 @@
     "express-validator": "^6.14.2",
     "got": "^12.1.0",
     "helmet": "^5.1.0",
+    "redis": "^4.2.0",
     "winston": "^3.8.1"
   },
   "devDependencies": {