Add build scripts for macOS

Include build scripts for generating CMake cache as well as building from ninja.

00-build-cache-debug-x64

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+#!/usr/bin/env sh
+
+cmake -DPROJECT_SOURCE_DIR=. -DCMAKE_SIZEOF_VOID_P=8 -DCMAKE_BUILD_TYPE=Debug -DCMAKE_MAKE_PROGRAM=ninja -DCMAKE_C_COMPILER=cc -DCMAKE_C_COMPILER_WORKS=1 -DCMAKE_C_FLAGS=-m64 -G Ninja -S . -B ./build/Debug

01-build-game

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+#!/usr/bin/env sh
+
+cmake --build build/Debug -t game

02-build-server

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+cmake --build build/Debug -t server