Add mention of the demo

Author: nicklasb

README.md

@@ -8,5 +8,8 @@ Quickly generate your your schema form using this GUI builder.
 - Provide source definition for different platforms
 - 100% test coverage
 
+# Demo
+There is a live demo at http://ralphowino.github.io/schema-form-builder
+
 # Simply need a html form?
-To generate vanilla/bootstrap/material forms checkout ralphowino.github.com/form-builder
+To generate vanilla/bootstrap/material forms check out ralphowino.github.com/form-builder