Adding documentation to the README

Author: sebbader

README.md

@@ -1,3 +1,53 @@
 # Java Model
 
-AAS model implemented in Java
+The AAS Java Model is an implementation of the Asset Administration Shell
+metamodel in Java. It contains all classes and properties as defined by the
+document 'Details of the Asset Administration Shell' published on
+[www.plattform-i40.de](https://www.plattform-i40.de).
+
+
+# Build and Use
+
+You can build the project using Maven by simply executing:
+
+`mvn clean install`
+
+or by integrating the library as a dependency:
+
+```
+<dependency>
+  <groupId>io.admin-shell.aas</groupId>
+  <artifactId>model</artifactId>
+  <version>latest-version</version>
+<dependency>
+```
+
+# Project Structure
+
+The project contains several packages.
+
+- io.adminshell.aas.v3.model: Location of the AAS classes as Java interfaces
+- io.adminshell.aas.v3.model.impl: Default implementations of the AAS classes. Can be replaced with custom implementations if needed.
+- io.adminshell.aas.v3.model.builder: Provided builder classes to create the instances of the AAS classes
+- io.adminshell.aas.v3.dataformat: Interfaces for the serialization formats, for instance JSON, XML, AASX etc. Own serializers can be developed by implementing these interfaces. See also the provided default [serializers](https://github.com/admin-shell-io/java-serializer).
+
+# How to Contribute
+
+We always look for contributions, bug reports, feature requests etc. Simply open an [issue](https://github.com/admin-shell-io/java-model/issues) or - even better - directly propose a change through a [pull request](https://github.com/admin-shell-io/java-model/pulls).
+
+
+# Contributers
+
+| Name | Affiliation | Github Account |
+|:--| -- | -- |
+| Sebastian Bader | Fraunhoder IAIS | [sebbader](https://github.com/sebbader) |
+| Matthias Böckmann | Fraunhoder IAIS | [maboeckmann](https://github.com/maboeckmann) |
+| Chang Qin | Fraunhoder IAIS | [changqin26](https://github.com/changqin26) |
+| Michael Jacoby | Fraunhoder IOSB | []() |
+| Maximilian Conradi | Fraunhoder IESE | []() |
+| Jan-Wilhelm Blume | Fraunhoder IOSB | []() |
+| Frank Schnicke | Fraunhoder IESE | []() |
+| Jens Müller | Fraunhoder IOSB | []() |
+| Daniel Espen | Fraunhoder IESE | []() |
+| Bastian Espen | Fraunhoder IOSB | []() |
+| Michael Jacoby | Fraunhoder IOSB | []() |