Add project files

breeze/cmake/toolchains/windows-arm64-clang-cl.cmake

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+# windows-arm64-clang-cl: LLVM's clang-cl (the cl.exe-compatible driver)
+# building for ARM64 Windows with the MSVC ABI.
+#
+# The target is pinned to aarch64-pc-windows-msvc (--target=), so this means
+# ARM64 regardless of the machine's own architecture (an x64 machine
+# cross-compiles). The MSVC STL headers and Windows SDK libraries, including
+# their ARM64 variants, still come from a Visual Studio / Build Tools install.
+#
+# See _common.cmake (pmn_clang_cl_toolchain).
+include("${CMAKE_CURRENT_LIST_DIR}/_common.cmake")
+
+pmn_toolchain_target("windows-arm64-clang-cl")
+pmn_clang_cl_toolchain(arm64)