Add Makefile and macOS App build template

Makefile

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+.PHONY: debug release run run-release macos clean
+
+debug:
+	zig build
+
+run:
+	zig build run
+
+release:
+	zig build -Doptimize=ReleaseFast
+
+run-release:
+	zig build -Doptimize=ReleaseFast run
+
+macos: release
+	cp -r templates/macos-app/DepartureBoard.app zig-out/
+	cp zig-out/bin/raylib-test zig-out/DepartureBoard.app/Contents/MacOS/DepartureBoard
+
+clean:
+	rm -r zig-out

templates/macos-app/DepartureBoard.app/Contents/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleExecutable</key>
+  <string>ExecutableFileName</string>
+  <key>CFBundleIconFile</key>
+  <string>AppIcon</string>
+  <key>CFBundleIdentifier</key>
+  <string>ro.dcdev.departure_board_zig</string>
+  <key>CFBundleExecutable</key>
+  <string>DepartureBoard</string>
+</dict>
+</plist>