add setup script for development environment

xcode/aux_scripts/setup_development_environment.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+PROJECT_PATH=$1
+
+cd ${PROJECT_PATH}
+
+# Install ruby dependencies (cocoapods, fastlane, etc.)
+bundle install
+
+# install Homebrew
+if [[ $(command -v brew) == "" ]]; then
+    # Prevent "Press RETURN to continue or any other key to abort" message when installing Homebrew
+    export CI=true
+
+    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+fi
+
+# Install brew dependencies (carthage, etc.)
+brew bundle
+
+# Install pods dependencies
+bundle exec pod repo update
+bundle exec pod install
+
+# Install carthage dependencies
+carthage bootstrap --platform iOS