Add badges to README.md

Author: marcusolsson

README.md

@@ -1,5 +1,8 @@
 # dts-docs
 
+[![npm version](https://img.shields.io/npm/v/dts-docs.svg?style=flat-square)](https://www.npmjs.org/package/dts-docs)
+[![CI](https://github.com/marcusolsson/dts-docs/actions/workflows/node.js.yml/badge.svg)](https://github.com/marcusolsson/dts-docs/actions/workflows/node.js.yml)
+
 A command-line tool for generating Markdown documentation for a `.d.ts` file.
 
 > [!IMPORTANT]