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
These 5 lines, with "Tutorial" at their start: I think both the link text and the file names should have "Tutorial" removed now that they're inside a tutorial-specific folder.