doc: document Nova support

Author: ChALkeR

README.md

@@ -31,6 +31,7 @@ It can run your existing tests on [all runtimes and also browsers](#engines), wi
 [![XS](https://img.shields.io/badge/XS-0B307A?style=flat-square)](https://github.com/Moddable-OpenSource/moddable)
 [![GraalJS](https://img.shields.io/badge/GraalJS-C74634?style=flat-square)](https://github.com/oracle/graaljs)
 [![Boa](https://img.shields.io/badge/Boa-F3FF00?style=flat-square)](https://github.com/boa-dev/boa)
+[![Nova](https://img.shields.io/badge/Nova-FF810A?style=flat-square)](https://github.com/trynova/nova)
 [![Escargot](https://img.shields.io/badge/Escargot-1428A0?style=flat-square)](https://github.com/Samsung/escargot)
 [![engine262](https://img.shields.io/badge/engine262-f0db4f?style=flat-square&logo=javascript&logoColor=000)](https://github.com/engine262/engine262)