add a simple readme

README.md

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+# bs-customizer
+
+[![dependencies Status](https://img.shields.io/david/Johann-S/bs-customizer.svg)](https://david-dm.org/Johann-S/bs-customizer)
+[![devDependencies Status](https://img.shields.io/david/dev/Johann-S/bs-customizer.svg)](https://david-dm.org/Johann-S/bs-customizer?type=dev)
+
+A simple customizer which allow you to build a custom version of Bootstrap 4
+
+Features:
+
+ - Select just a few plugins
+ - Minify your custom version
+ - Choose to include Popper.js or not
+
+You can use it --> [here](https://johann-s.github.io/bs-customizer/)
+
+## Support me
+
+If you want to thank me, you can support me and become my [Patron](https://www.patreon.com/jservoire) :wink:
+
+## License
+
+[MIT](https://github.com/Johann-S/bs-customizer/blob/master/LICENSE)