#75 Snap.svg demonstration

Originally at 2015-01-13T15:37:03Z by Hannes Hirzel closed at 2015-01-26T16:42:01Z I'd like to add a [snap.svg] example which shows how to add and use an external library. @amber-smalltalk/owners , may I ask you for a [code review](https://github.com/hhzl/Amber-snapsvg-demo/issues/1). After that I'd like to move the code to the amber organisation.