Add mongo init database script.

src/mongodb/initDatabase.js

@@ -0,0 +1,14 @@
+use express-test;
+
+db.collection.test.insert({id: 'test'});
+
+db.createUser(
+    {
+      user: "express-user",
+      pwd: "P@ssword1",
+      roles:
+        [
+          { role: "readWrite", db: "express-test" }
+        ]
+    }
+)