docs: add badges

Author: marionebl

README.md

@@ -2,6 +2,8 @@
 
 # commitlint
 
+[![npm latest][2]][3] [![npm next][10]][3] [![Travis branch][4]][5] [![AppVeyor branch][6]][7]
+
 *  🚓  Enforce commit conventions
 *  🤖  Plays nice with `conventional-changelog`
 *  📦  Supports shareable configuration
@@ -78,3 +80,18 @@ npm install
 npm start # run tests, again on change
 npm run build # run build tasks
 ```
+
+
+[0]: https://img.shields.io/badge/stability-stable-green.svg?style=flat-square
+[1]: https://nodejs.org/api/documentation.html#documentation_stability_index
+[2]: https://img.shields.io/npm/v/@commitlint/core.svg?style=flat-square
+[3]: https://npmjs.org/package/@commitlint/core/latest.svg
+[4]: https://img.shields.io/travis/marionebl/commitlint/master.svg?style=flat-square
+[5]: https://travis-ci.org/marionebl/commitlint
+[6]: https://img.shields.io/appveyor/ci/marionebl/commitlint/master.svg?style=flat-square
+[7]: https://ci.appveyor.com/project/marionebl/commitlint
+
+[8]: https://img.shields.io/badge/stability-experimental-orange.svg?style=flat-square
+[9]: https://nodejs.org/api/documentation.html#documentation_stability_index
+
+[10]: https://img.shields.io/npm/v/@commitlint/core/next.svg?style=flat-square