Added README to content repository

README.md

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+#Scala Exercises - Cats library
+
+------------------------
+
+This repository hosts a content library for the [Scala Exercises](https://www.scala-exercises.org/) platform, that includes interactive exercises related to the [Cats library](https://github.com/typelevel/cats) by Typelevel.
+
+##About Scala exercises
+
+"Scala Exercises" brings exercises for the Stdlib, Cats, Shapeless and many other great libraries for Scala to your browser. Offering hundreds of solvable exercises organized into several categories covering the basics of the Scala language and its most important libraries.
+
+Scala Exercises is available at [scala-exercises.org](https://scala-exercises.org).
+
+##Contributing
+
+Contributions are welcome! Please join our [Gitter channel](https://gitter.im/scala-exercises/scala-exercises)
+to get involved, or visit our [GitHub site](https://github.com/scala-exercises).
+
+##License
+
+Copyright (C) 2015-2016 47 Degrees, LLC.
+Reactive, scalable software solutions.
+http://47deg.com
+hello@47deg.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.