Update readme

Author: Sander Toonen

README.md

@@ -1,14 +1,23 @@
-JavaScript Expression Evaluator
-===============================
+Expression Evaluator
+==================================
 
 [![npm](https://img.shields.io/npm/v/expr-eval.svg?maxAge=3600)](https://www.npmjs.com/package/expr-eval)
 [![CDNJS version](https://img.shields.io/cdnjs/v/expr-eval.svg?maxAge=3600)](https://cdnjs.com/libraries/expr-eval)
 [![Build Status](https://travis-ci.org/silentmatt/expr-eval.svg?branch=master)](https://travis-ci.org/silentmatt/expr-eval)
 
 Description
 -------------------------------------
-**This is a fork of expr-eval 2.0.2 with some enhancements, as it appears that package is no longer being maintained.  This fork
-adds the following enhancements.**
+**This is a modern TypeScript port of the expr-eval library, completely rewritten with contemporary build tools and development practices.** Originally based on expr-eval 2.0.2, this version has been restructured with a modular architecture, full TypeScript support, and comprehensive testing using Vitest. The library almost maintains backward compatibility while providing enhanced features and improved maintainability.
+
+This port adds the following enhancements over the original:
+
+### Support for json() function ###
+
+This wil return a json string:
+
+```js
+json([1, 2, 3])
+```
 
 ### Support for undefined ###