Update README.md

Author: abooarulraj

README.md

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 A quick-start example to help you add Syncfusion Flutter PDF library to a Flutter app. In this example, you will learn how to create a PDF document and add text, images, and tables to it. You will also learn how to save the file and download the document on a mobile and in the web.
 
-Watch the video: Coming soon...
+Watch the video: https://www.syncfusion.com/tutorial-videos/flutter/pdf?title=create-a-pdf-document-in-flutter
 
 Documentation: https://help.syncfusion.com/flutter/pdf/overview