Idea from the B-Sides workshop - install instructions for Mac OSX

An idea that’s come up on the workshop is to have some install instructions (or perhaps a script) for dradis on Mac OSX

Thanks Rory,

I think that the only thing worth rescuing from the original MacOS install instructions is the fact that you need Xcode (to compile some of the dependencies).

Other than that, the standard instructions to install from Git should work on Mac as well.