Update README.md

Author: charlesbuczel

README.md

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 # leetcode.js
-JS solutions to leetcode practice problems. 
+LeetCode solutions in JavaScript (ES6+).
 
-Usually aiming for a balance of simplicity and performance.
+[leetcode.com/problemset/all](https://leetcode.com/problemset/all/)
+
+
+- Usually aiming for a balance between simplicity and performance.
+- Space and  time complexity documented
+- JSDocs included
+- Prettier formatted
 
 # Credits