Adapt Readme

Tell the user what the Rhenus server is about and what this component is
doing
Add license info

At the start of each source file should be stated that it is belonging
to the project and that it is distributed under the terms of the GPL
Add unit tests

In order to test what is developed, fill the test step in the build
process. Assume that we are using NUnit as provided by nant, have a
"tests" folder under src to contain the same structure of classes as
their regarding tests and write an initial test