Add license

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2023 1up GmbH
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

@@ -1,3 +1,8 @@
 contao-backend-limited-width
 ============================
+
+[![Author](http://img.shields.io/badge/author-@1upgmbh-blue.svg?style=flat-square)](https://twitter.com/1upgmbh)
+[![License](https://poser.pugx.org/oneup/contao-backend-limited-width/license)](https://github.com/1up-lab/contao-backend-limited-width/blob/main/LICENSE)
+[![Latest Stable Version](https://poser.pugx.org/oneup/contao-backend-limited-width/version)](https://packagist.org/packages/oneup/contao-backend-limited-width) [![Total Downloads](https://poser.pugx.org/oneup/contao-backend-limited-width/downloads)](https://packagist.org/packages/oneup/contao-backend-limited-width)
+
 Simply because https://github.com/contao/contao/pull/4552.