Update README.md

Author: robmelfi

README.md

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 # 21-Points Health (React Version)
 This application refers to the book [“The JHipster Mini-Book by Matt Raible”](http://www.jhipster-book.com). In this application the examples of the book are made using React instead of Angular.
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 This is the [Angular Web App](https://www.21-points.com) version.
 
+Demo of [21 Points Health v1.0.0 (React)](https://twentyone-points-react.herokuapp.com)
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 This application was generated using JHipster 5.4.1, you can find documentation and help at [https://www.jhipster.tech/documentation-archive/v5.4.1](https://www.jhipster.tech/documentation-archive/v5.4.1).
 
 ## Development