docs: add links to demo webapp

Author: khatastroffik

README.md

@@ -12,7 +12,14 @@ e.g. to render the text corresponding to a `DateOfBirth` field (Date type) withi
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-## Documentation: Storybook, Changelog and Release note
+## Documentation: Demo, Storybook, Changelog and Release note
+
+### Demo Webapp
+
+A webapp demonstrating the usage of this library is available:
+
+- Demo web app &rarr; [Demo - react-text-renderer-components](https://khatastroffik.github.io/react-text-renderer-components-demo)
+- Demo source code &rarr; [Github - react-text-renderer-components-demo](https://github.com/khatastroffik/react-text-renderer-components-demo)
 
 ### Storybook documentation