Update README.md

Author: quockhanhtn

README.md

@@ -5,6 +5,7 @@ Final project of OOP course at HCMUTE
     • Design language : Material Design (Use Material Design In XAML package by James Willock) <br>
     • Database : XML file <br>
     • Design pattern : Model - View - ViewModel <br>
+    • Integrated development environment (IDE) : Visual Studio <br>
     • Author : Khanh Lam Quoc, Hoang Ho Huy <br>
  <br>
 VIDEO DEMO : https://youtu.be/i-c7GIz139Q <br>