Merge pull request #14 from docusign/raileendr-patch-2

Update README.md

Author: raileendr

README.md

@@ -2,6 +2,9 @@
 ## Introduction
 This reference implementation models the use case of taking an agreement PDF sent by the Docusign platform using a file archive extension app and storing it locally.
 
+## Video Walkthrough
+[![Reference implementation videos](https://img.youtube.com/vi/_4p7GWK5aoA/0.jpg)](https://youtube.com/playlist?list=PLXpRTgmbu4oqnHn6pusz4riseJHKZ42HW&feature=shared)
+
 ## Setup instructions
 ### 1. Clone the repository
 Run the following command to clone the repository: