Update vanillajs_pouchdb.md

Added tutorial URL

_how_tos/vanillajs_pouchdb.md

@@ -2,9 +2,9 @@
 title:      Vanilla Javascript and PouchDB
 headline:   Learn how to build an Offline First shopping list demo app using Vanilla Javascript and <a href="https://pouchdb.com">PouchDB</a>
 repo_url:   https://github.com/ibm-watson-data-lab/shopping-list-vanillajs-pouchdb
-tutorial_url:   
+tutorial_url: https://github.com/ibm-watson-data-lab/shopping-list-vanillajs-pouchdb/tree/master/tutorial   
 demo_url: https://ibm-watson-data-lab.github.io/shopping-list-vanillajs-pouchdb
 type: Progressive Web App
 author:     Va Barbosa
 author_url: https://github.com/vabarbosa
----
+---