Updating information

Adding Redis in the recommendations section.
Inserting a demo section.

README.md

@@ -45,8 +45,9 @@ We try to make sure vichan is compatible with all major web servers. vichan does
 1.	MySQL/MariaDB server >= 5.5.3
 2.	ImageMagick (command-line ImageMagick or GraphicsMagick preferred).
 3.	[APC (Alternative PHP Cache)](http://php.net/manual/en/book.apc.php),
-	[XCache](http://xcache.lighttpd.net/) or
-	[Memcached](http://www.php.net/manual/en/intro.memcached.php)
+	[XCache](http://xcache.lighttpd.net/),
+	[Memcached](http://www.php.net/manual/en/intro.memcached.php) or
+	[Redis](https://redis.io/docs/about/)
 
 Contributing
 ------------