Update the Mac getting started guide

[nhurde]

Create main page that links to Mac page for getting editor started from git clone to build and run:

• System development libraries
  -Does user have system rights to install?
  -Detail supported C++ versions
  -Detail any system dependencies and scripts
  -Installing Git

IDE

• CodeBlocks
• Sublime
• Visual Studio Community Edition
• XCode

Compilers

Does the IDEs listed above, come with a compiler?
-If so is it compatible with GPE and user's preferred backend module.
-If not, how can they attach a compatible compiler to their IDE or tool of choice?

Include main modules and 32bit and 64bit versions.

Document how to link and include module of user choice.

Currently supported modules are:

• SDL2 ( 32bit and 64 bit)
• Raylib ( 64 Bit only)