FLUID-5377: Converted Getting Started tutorial

Converted the getting started tutorial to markdown.
http://wiki.fluidproject.org/display/docs/Tutorial+-+Getting+started+with+Infusion

http://issues.fluidproject.org/browse/FLUID-5377
@acheetham let me know if you want me to change anything regarding this. I'm thinking it might be something that we do after we get DocPad working.