add sample for ch10s03 lab

todo-backend/models/db.js

@@ -0,0 +1,10 @@
+
+module.exports.params = {
+  dbname: process.env.DATABASE_NAME,
+  username: process.env.DATABASE_USER,
+  password: process.env.DATABASE_PASSWORD,
+  params: {
+      host: process.env.DATABASE_SVC,
+      dialect: 'mysql',
+  }
+};