doc: create WorldNcovSchema schema and model

models/WorldData.js

@@ -0,0 +1,12 @@
+import mongoose from "mongoose";
+
+const WorldNcovSchema = mongoose.Schema({
+  retdata: [],
+  date: {
+    type: Date,
+    default: Date.now(),
+  },
+});
+
+const WorldNcovData = mongoose.model("WorldNcovData", WorldNcovSchema);
+export default WorldNcovData;