Create Building-on-MacOS.md

Building-on-MacOS.md

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+# Overview
+
+## Before You Start
+
+You should be at least moderately comfortable with Git, CMake, and the command
+line before relying on this method. It requires a good bit of free hard drive 
+space due to the large amount of dependencies required for the build (see below)
+and is meant for programmers that want to help discover and fix programming 
+errors. When in doubt go for [binaries](Home) instead!
+
+# How to Build Barrier.app on MacOS
+
+*as of May 2020*
+
+- Install Xcode from the App Store or download and install it 
+from the [Apple Developer Website](https://developer.apple.com/download/more/?=xcode)
+- Install either [MacPorts](https://www.macports.org/) or [Homebrew](https://brew.sh/) 
+following the instructions on their websites
+- Install dependencies with either MacPorts or Homebrew (see below)
+- Build either the `Debug` or the `Release` targets (see below)
+
+### Install dependencies with MacPorts
+
+  - Install packages for Qt5, OpenSSL, and PkgConfig
+  ```
+  sudo port install qt5 openssl pkgconfig
+  ```
+  
+### Install dependencies with Homebrew
+
+  - Install packages for Qt5, OpenSSL, and pkgconfig
+  ```
+  brew install qt5 openssl pkg-config
+  ```
+  
+### Clone the repository
+
+  ```
+  git clone https://github.com/debauchee/barrier
+  ```
+  - Change directories into the cloned repository
+  ```
+  cd barrier
+  ```
+ 
+### Build the Debug target
+  *The debug target produces un-stripped binaries that have symbols that can be 
+  used for debugging.*
+
+  - Build the `Debug` target using the `clean_build.sh` script
+  ```
+  ./clean_build.sh
+  ```
+  
+  By default the resulting binaries will be in `./build/bin` and the 
+  application bundle (.app) will be in `./build/bundle`. The debug target
+  does not create a disk image (dmg).
+
+### Build the Release target
+  *The release target produces smaller stripped binaries and distributable disk image. 
+  This is probably what you want if you are a user.*
+  
+  - Build the `Release` target using the `clean_build.sh` script with environment variables
+  
+  *This step assumes the use of a bourne-like shell (i.e. bash). If using another shell like*
+  `csh` *change the export command to use* `setenv` *instead*.
+  ```
+  export B_BUILD_TYPE=Release
+  ./clean_build.sh
+  ```
+  
+  By default the resulting binaries will be in `./build/bin` and the 
+  application bundle (.app) will be in `./build/bundle`. The release target
+  also creates a disk image (dmg).
+  
+#### Notes
+  
+  A [`build_env.sh`](https://github.com/debauchee/barrier/blob/b6a1b5742006157c3fe746288961a9d2827a3f26/clean_build.sh#L20)
+  file can be created for persistent build environment variables [without being tracked by git](https://github.com/debauchee/barrier/blob/b6a1b5742006157c3fe746288961a9d2827a3f26/.gitignore#L1)
+