Readme added.

README.md

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+# The Object Transformer Bundle
+
+![Maintenance Status](https://img.shields.io/badge/Maintained%3F-yes-green.svg)
+[![Build Status](https://app.travis-ci.com/it-bens/object-transformer-bundle.svg?branch=master)](https://app.travis-ci.com/it-bens/object-transformer-bundle)
+[![Coverage Status](https://coveralls.io/repos/github/it-bens/object-transformer-bundle/badge.svg?branch=master)](https://coveralls.io/github/it-bens/object-transformer-bundle?branch=master)
+
+## How to install the bundle?
+The package can be installed via Composer:
+```bash
+composer require it-bens/object-transformer-bundle
+```
+If you're using Symfony Flex, the bundle will be automatically enabled. For older apps, enable it in your Kernel class.
+
+## How to use the Object Transformer Bundle?
+The `TransformationMediator` is registered as a service and all implementations of the `TransformerInterface` 
+are registered as transformers in the mediator (if they are configured via autoconfiguration). 
+Otherwise, the transformers have to be tagged with `itb_object_transformer.transformer`.
+
+The usage of the object transformer is described here: [GitHub - The Object Transformer](https://github.com/it-bens/object-transformer).
+
+## Contributing
+I am really happy that the software developer community loves Open Source, like I do! ♥
+
+That's why I appreciate every issue that is opened (preferably constructive)
+and every pull request that provides other or even better code to this package.
+
+You are all breathtaking!