doc: add ncovChinaSchema and model

models/ncovChinaData.js

@@ -0,0 +1,18 @@
+import mongoose from "mongoose";
+
+const ncovChinaSchema = mongoose.Schema({
+  newslist: [
+    {
+      news: { type: Array },
+      desc: { type: Array },
+      riskarea: { type: Array },
+    },
+  ],
+  date: {
+      type: Date,
+      default: Date.now();
+  }
+});
+
+const ncovChinaData = mongoose.model('ncovChinaData', ncovChinaSchema);
+export default ncovChinaData;