Update README.md to an appropriate level

README.md

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-# envoy-client
+# Envoy Client
+
+<a href="https://github.com/informatik-ag-ngl/envoy-client"><img src="https://raw.githubusercontent.com/informatik-ag-ngl/envoy-client/develop/src/main/resources/envoy_logo.png" align="left" width="200" height="200"></a>
+
+**Envoy Client** is one of two repositories needed to use the messenger Envoy.<br>
+The other one is <a href="https://github.com/informatik-ag-ngl/envoy-common">**Envoy Common**</a>.<br>
+In the future, Envoy Common might be discarded, but for now, both Repositories are required in order to use Envoy to send messages to other people.<br>
+<br><br>
+
+## Features
+
+Envoy Client features a lot of things and many more are yet to come.
+Currently existing features are:
+
+* Users
+  * Saving and loading of messages
+  * Login via name
+  * Settings to change the behavior of _Envoy_
+* UI
+  * Appealing user interface
+  * Changeable themes that store the colors used in _Envoy_
+  * Possibility to run _Envoy_ in the Background once it has been started
+    * **Attention**: currently works solely on Windows and Mac 
+    * Possibility to exit _Envoy_
+* Connectivity
+  * Sending messages to another person via a predefined server
+  * Offline mode
+* Programming
+  * API to change default configuration
+  * Advanced logging possibilities
+  * Access without Admin rights possible via local message storage in the home       folder
+  * Tons of Events to interact with
+  * Detailed Javadoc to improve readability of code
+  
+## Resources
+
+* [API Reference (later on)](https://github.com/informatik-ag-ngl/envoy-client/wiki)
+* [Release Notes](https://github.com/informatik-ag-ngl/envoy-client/releases)
+* [Gallery (later on)](https://github.com/informatik-ag-ngl/envoy-client/wiki/Gallery)
+* [Wiki](https://github.com/informatik-ag-ngl/envoy-client/wiki)