Update README.md

Add download button as requested by some users.

Author: coddec

README.md

@@ -18,6 +18,11 @@
 - Show file size in Explorer status bar
 - Title bar and status bar for Internet Explorer
 
+### Download
+If you just want to use it or looking for setup file, click here to download!!!
+
+[![GitHub All Releases](https://img.shields.io/github/downloads/Open-Shell/Open-Shell-Menu/total?style=for-the-badge)](https://github.com/Open-Shell/Open-Shell-Menu/releases)
+
 ---
 
 *For archival reasons, we have a mirror of `www.classicshell.net` [here](https://coddec.github.io/Classic-Shell/www.classicshell.net/).*