Licence added: CC-BY-SA 3.0

[erikbgithub]

To enable other people the usage of this text a public license was added. Although it's generally better to use a software license like GPL for the source code, it was decided to license the source code here under the same license, because it's basically a demonstration code base and not really meant for any productive use.

As the author of this commit and all appending changes I, Erik Bernoth, hereby grant full CC-BY-SA 3.0 rights to all contributions added by this commit.

Signed-off-by: Erik Bernoth [email protected]