Update README.md

Author: yushulx

README.md

@@ -11,6 +11,10 @@
 
 > Also see [Dynamsoft JavaScript Barcode SDK for Node](https://github.com/Dynamsoft/javascript-barcode/blob/master/README.NODE.md).
 
+## What You Should Know
+- [![](https://img.shields.io/badge/Download-Offline%20SDK-orange)](https://www.dynamsoft.com/barcode-reader/downloads)
+- [![](https://img.shields.io/badge/Get-30--day%20FREE%20Trial%20License-blue)](https://www.dynamsoft.com/customer/license/trialLicense/?product=dbr)
+
 ## Install
 
 yarn