Update MIT license and readme

Author: benwinding

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) [year] [fullname]
+
+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

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-A firebase data provider for the [React-Admin](https://github.com/marmelab/react-admin) framework. It maps collections from the Firebase database (Firestore) to your react-admin application. It's an [npm package](https://www.npmjs.com/package/react-admin-firebase).
+# react-admin-firebase
+
+<!-- [START badges] -->
+[![NPM Version](https://img.shields.io/npm/v/react-admin-firebase.svg)](https://www.npmjs.com/package/react-admin-firebase) 
+[![License](https://img.shields.io/npm/l/react-admin-firebase.svg)](https://github.com/benwinding/react-admin-firebase/blob/master/LICENSE) 
+[![Downloads/week](https://img.shields.io/npm/dm/react-admin-firebase.svg)](https://www.npmjs.com/package/react-admin-firebase) 
+[![Github Issues](https://img.shields.io/github/issues/benwinding/react-admin-firebase.svg)](https://github.com/benwinding/react-admin-firebase)
+<!-- [END badges] -->
+
+A firebase data provider for the [React-Admin](https://github.com/marmelab/react-admin) framework. It maps collections from the Firebase database (Firestore) to your react-admin application. It's an [npm package](https://www.npmjs.com/package/react-admin-firebase)!
 
 ## Features
 - [x] Dynamic caching of resources