Update readme with download link

Author: wappenull

README.md

@@ -1,10 +1,10 @@
-# PdfToImage
+# PdfToImage C# GUI
 * Convert PDF To jpg/png in c# (using PdfiumViewer).
 * Now with over-engineered GUI!
 
 ![Alt text](./readme_img1.png)
 
-# [Download EXE]()
+# [Download EXE](https://github.com/wappenull/PdfToImageGUI/releases/download/v1.0/PdfToImageGUI_v1.0.zip)
 Now V1.0
 
 # Runtime dist