Update README.md

Author: ah-naf

README.md

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 SimpleOJ is an interactive online platform for coding enthusiasts. It allows users to solve programming challenges and run code snippets in C, C++, Java, and Python.
 
+You can use [@ah_naf/runcode](https://www.npmjs.com/package/@ah_naf/runcode) npm package to run C, C++, Python and Java code.
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 ## Demo
 
 For a visual demonstration of SimpleOJ in action, check out our [video demo](https://youtu.be/Xfc7_3AgQOw).