Added tutorial video link.

Author: ArulrajAboo

README.md

@@ -1,7 +1,7 @@
 # How to Create Flutter Charts from JSON Data
 A quick-start example to help you create a chart from JSON data using the Syncfusion Flutter Chart. You will learn how to load the JSON data and map it to the chart series.
 
-Watch the video: Coming soon...
+Watch the video: https://www.syncfusion.com/tutorial-videos/flutter/charts?title=how-to-create-flutter-charts-from-json-data 
 
 Documentation: https://help.syncfusion.com/flutter/cartesian-charts/getting-started