Center README text

README.md

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-# qr_image
+# QRImage
 
 <p align="center">
     <img src="images/demo.png">
 </p>
 
-A website to generate valid QR codes with images in the background.
+<p align="center">
+    QRImage is a web app to generate QR codes with images.
+</p>
 
 ### Usage