Update unexpectedly lost English documents

Author: cary-rowen

README.md

@@ -2,6 +2,8 @@
 
 ## Introduction
 
+NonVisual Desktop Access ([NVDA]) is a free and open source screen reader for the Microsoft Windows operating system. 
+
 This update mirror source is provided for NVDA Chinese community users. It can enhance the update speed of NVDA, improve the search and download speed of the add-on store, and resolve issues where certain network operators are unable to download add-ons from the add-on store, thus effectively improving user experience.
 
 ## Usage
@@ -18,3 +20,5 @@ This mirror source service aims to speed up the download and update speed of NVD
 * @zh-yx
 * @Cary-rowen
 * @hwf1324
+
+[NVDA]: https://github.com/nvaccess/nvda/