Fix spelling

README.md

@@ -3,9 +3,9 @@
 [![GitHub Pages](https://github.com/CrescNet/growth-js/actions/workflows/gh-pages.yml/badge.svg?branch=master)](https://github.com/CrescNet/growth-js/actions/workflows/gh-pages.yml)
 
 ## Description
-This single site application visualizes growth data of children with Chart.js. Users are able to select from multiple reference values.
+This single-site application visualizes child growth data using Chart.js. Users can choose from multiple reference values.
 
-After entering data users can save to the browsers local storage or to a JSON file. They can also create a QR code containing the data.
+After data entry, users can save the data to the browser's local storage or to a JSON file. They can also create a QR code that contains the data.
 
 ## Project setup
 ```