chore: add codecov and badges

.github/workflows/main.yml

@@ -29,3 +29,6 @@ jobs:
 
       - name: ▶️ Run test script
         run: npm run test
+
+      - name: ⬆️ Upload coverage report
+        uses: codecov/codecov-action@v1

README.md

@@ -2,6 +2,20 @@
 webpack memory compile
 ----------------------
 
+[![build status][build-badge]][build]
+[![code coverage][coverage-badge]][coverage]
+[![npm version][version-badge]][package]
+[![apache license][license-badge]][license]
+
+[build-badge]: https://img.shields.io/github/workflow/status/krakenjs/webpack-mem-compile/build?logo=github&style=flat-square
+[build]: https://github.com/krakenjs/webpack-mem-compile/actions?query=workflow%3Abuild
+[coverage-badge]: https://img.shields.io/codecov/c/github/krakenjs/webpack-mem-compile.svg?style=flat-square
+[coverage]: https://codecov.io/github/krakenjs/webpack-mem-compile/
+[version-badge]: https://img.shields.io/npm/v/@krakenjs/webpack-mem-compile.svg?style=flat-square
+[package]: https://www.npmjs.com/package/@krakenjs/webpack-mem-compile
+[license-badge]: https://img.shields.io/npm/l/@krakenjs/webpack-mem-compile.svg?style=flat-square
+[license]: https://github.com/krakenjs/webpack-mem-compile/blob/main/LICENSE
+
 Compile from a webpack config to a string in memory.
 
 ## Install