docs: add badges to readme

Author: anonrig

README.md

@@ -1,5 +1,9 @@
 # fast-querystring
 
+![Test](https://github.com/anonrig/fast-querystring/workflows/test/badge.svg)
+[![codecov](https://codecov.io/gh/anonrig/fast-querystring/branch/main/graph/badge.svg?token=4ZDJA2BMOH)](https://codecov.io/gh/anonrig/fast-querystring)
+[![NPM version](https://img.shields.io/npm/v/fast-querystring.svg?style=flat)](https://www.npmjs.com/package/fast-querystring)
+
 Fast query-string parser and stringifier to replace the legacy `node:querystring` module.
 
 ### Installation