Update README

Split the README into a project description for users, server admins and programmers. This should be more understandable for users that are not part of the project.

README.md

@@ -1,45 +1,52 @@
 # Envoy
----
-<a href="https://git.kske.dev/zdm/envoy"><img src="https://git.kske.dev/repo-avatars/33-31e14133097b01b748ab361e3c3adb47" align="right" width="150" height="150"></a>
 
-**Envoy** is a messenger written in Java.<br>
-It is split into three separate components: Envoy Client, Envoy Common and Envoy Server.
-<br><br><br><br><br>
----
-### Envoy Client:
-This is the only part users are interested in. It contains everything to make this messenger work: the UI.
-### Envoy Server:
-Envoy offers the option to download and host your own server over which Envoy can run.<br>
-This part will be especially appealing to institutions/organizations who want to self-host Envoy.
-### Envoy Common:
-This part contains elements that both the client and the server need. It will be automatically part of either one (Thanks, Maven!).
+<img src="https://git.kske.dev/repo-avatars/33-31e14133097b01b748ab361e3c3adb47" style="display: block" width="150" height="150">
 
-## Features
+Envoy is a messenger written in Java.
+On this page, the project is explained for different user groups.
 
-Envoy features a lot of things and many more are yet to come.
-Currently existing features are:
+## Regular User
 
-#### 'Client' contains:
+To use Envoy to join an existing server, download the client from the [release page](https://git.kske.dev/zdm/envoy/releases).
 
-* typical Messenger features (sending and receiving of messages, groups, sending images and voice messages)
-* typical Messenger feeling (displaying unread messages)
-* Appealing user interface (UI)
+When starting it for the first time, you can register yourself at a server of your choice.
+After connecting to the server, you can add other users to your contact list and send them messages.
 
-* Programming
-  * API to change default configuration
-  * Advanced logging possibilities
-  * Tons of Events to interact with
-  * Detailed Javadoc to improve readability of code
+To chat with multiple users at once, you can create a group.
+If you want to transfer a file to another user, you can attach it to a message.
 
-#### 'Common' contains:
-* the event system
-* the logger
-* Envoy-specific Exceptions
-* some util classes
-* the most basic datatypes
+On the settings page some convenience features can be configured, as well as the color theme.
 
-#### 'Server' contains:
-* the database implementation of the data classes
-* the connectivity classes
-* processors to handle incoming events
-* Utility classes to check client version compatability and Password validity
+## Server Administrator
+
+To set up an Envoy server, download the package from the release page.
+
+Because the project lacks external documentation for the moment, please refer to the Javadoc inside the source code to configure your Envoy instance.
+
+## Programmer
+
+Envoy is organized as a Maven project that is split into three modules.
+
+### Client
+
+* Sending and receiving of messages, groups, sending images and voice messages
+* User interface (UI)
+* Client configuration
+* Advanced logging possibilities
+* Tons of Events to interact with
+* Detailed Javadoc to improve readability of code
+
+### Common
+* Basic datatypes
+* Events sent between client and server
+* Configuration API
+* Logging API based on `java.util.logging`
+* Envoy-specific Exception
+* Useful utility classes
+
+### Server
+* Non-blocking connectivity infrastructure based on `java.nio`
+* Processors to handle incoming events
+* Database connectivity
+* Databse entities
+* Utility classes to check client version compatability and password validity