Add project files

breeze/cmake/toolchains/macos-x64-clang.cmake

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+# macos-x64-clang: Clang building for Intel macOS.
+#
+# Apple Clang from the Xcode Command Line Tools (xcode-select --install),
+# or LLVM's own Clang if you point -DCMAKE_CXX_COMPILER at it.
+#
+# The architecture is pinned with CMAKE_OSX_ARCHITECTURES (x86_64) rather
+# than left to whichever process launched the compiler, so this means x64
+# on an Apple Silicon Mac too -- where the result runs through Rosetta 2.
+# The minimum macOS is 11.0 unless you pass
+# -DCMAKE_OSX_DEPLOYMENT_TARGET=... yourself.
+#
+# See _common.cmake (pmn_macos_toolchain).
+include("${CMAKE_CURRENT_LIST_DIR}/_common.cmake")
+
+pmn_toolchain_target("macos-x64-clang")
+pmn_macos_toolchain(x64)