Created OSX Build (markdown)

OSX-Build.md

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+#### NOTE: WHILE OSX BUILDS WILL COMPILE, NO IMAGE WILL SHOW UPON LOADING A FILE!
+
+### Dependencies:
+
+It's recommended that you use [homebrew](https://brew.sh) to install dependencies.
+You'll need to download and install the following to build Citra:
+
+* [GLEW](http://glew.sourceforge.net/) (`brew install glew`)
+* [pkg-config](http://www.freedesktop.org/wiki/Software/pkg-config/) (`brew install pkgconfig`)
+* [GLFW](http://www.glfw.org/download.html) (`brew tap homebrew/versions`, `brew install glfw3`)
+* [Qt4](http://qt-project.org/downloads) (`brew install qt`)
+ * Note... Qt5 will be supported soon
+* [CMake](http://www.cmake.org/) (`brew install cmake`)
+
+#### Building GLFW from source:
+
+Should you choose not to use homebrew, type these commands in a terminal:
+
+```
+git clone https://github.com/glfw/glfw.git
+cd glfw
+mkdir build && cd build
+cmake ..
+make
+sudo make install
+```
+
+### Using CMake:
+
+```
+mkdir build
+cd build
+cmake .. -GXcode
+```
+Optionally, you can use `cmake -i ..` to adjust various options (e.g. disable Qt4 GUI).
+
+#### Building with debug symbols:
+
+```
+cmake .. -GXcode -DCMAKE_BUILD_TYPE=Debug
+```
+
+### Building Citra:
+
+Open the project file in Xcode, switch the target from `ALL_BUILD` to `citra` or `citra_qt`, and press the play button.