Add team schema

Server/models/Team.js

@@ -0,0 +1,12 @@
+const mongoose = require("mongoose");
+
+const TeamSchema = mongoose.Schema({
+  userId: {
+    type: mongoose.Schema.Types.ObjectId,
+    ref: "User",
+    immutable: true,
+  },
+  timestamps: true,
+});
+
+module.exports = mongoose.model("Team", TeamSchema);