a new relevant assignment: add a new assignment to express(103 routes and controllers )

nodeJS/express_and_mongoose/express_103_routes_and_controllers.md

@@ -1,8 +1,8 @@
 ### Introduction
 
 The next step in the MDN express tutorial sets up all the routes and controllers you're going to need when creating the Library project. This project is designed using the MVC (Model, View, Controller) architecture. In a previous step you set up all the Models (or Database Objects) and in the _next_ step you'll be setting up several different views.
 
 If you remember from our earlier lessons, the controller is the code that sits between the models and the views. It determines which view is going to be shown, as well as which information is going to populate that view. In this lesson, you will copy and paste quite a bit of repetitive code to get the controllers and routes set up, but be sure to read everything in between them! There is a _lot_ of useful information therein.
 
 ### Lesson overview
 
@@ -19,12 +19,14 @@
 <div class="lesson-content__panel" markdown="1">
 
 1. Complete part 4 of [the MDN Express tutorial](https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/routes).
+2. Back to the Mini Message Board project, create a new directory called `controllers` to store the callback functions for 
+your route handlers. Create a new file called `messageController.js` and move the callback functions from `index.js` to this new file.
 
 </div>
 
 ### Knowledge check
 
 This section contains questions for you to check your understanding of this lesson. If you’re having trouble answering the questions below on your own, review the material above to find the answer.
 
 - [How do you define a route function in Express?](https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/routes#defining_and_using_separate_route_modules)
 - [Name four HTTP verbs a route might need to handle.](https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/routes#http_verbs)