Added some links

Author: Christopher Harrison

README.md

@@ -39,6 +39,7 @@ Your team will obtain the starter, deploy the application to the cloud, enable a
 1. [Run the application locally](./goals/0-run-locally.md)
 1. [Deploy to the cloud](./goals/1-deploy.md)
 1. [Enable authentication](./goals/2-authentication.md)
+1. [Add a database](./goals/3-database.md)
 
 ## Where do we go from here?
 

goals/1-deploy.md

@@ -44,3 +44,7 @@ Your team might find these resources helpful:
 After you deploy and navigate to the site, you should see a page which looks like the following:
 
 ![Screenshot of the starting page, showing a link to login, a picture of a dog with the heading Isn't this a cute Pekinese dog?](./media/starter-page.png)
+
+## Next challenge
+
+Once you've deployed your application, it's time to [add authentication](./2-authentication.md).

goals/2-authentication.md

@@ -95,3 +95,7 @@ Your team might find these resources helpful:
 After enabling authentication and logging in via GitHub, the page should look like this:
 
 ![Screenshot of the starting page, showing a textbox where you can name the dog, and the header What would you call this cute Pyrenees dog?](./media/authentication.png)
+
+## Next challenge
+
+Once your team has configured authentication and authorization, you can [add a database](./3-database.md).