chore(README): add Apple Clang into supported compilers

Author: basiliscos

README.md

@@ -15,6 +15,7 @@
     - GCC 11 or above, or
     - Clang 12 or above, or
     - MSVC 14.29 (Visual Studio 2019 Version 16.9) or above
+    - Apple Clang 17 (Xcode 16.4) or above
 - CMake 3
 - GoogleTest (optional, for unit tests)
 - vcpkg (optional, `vcpkg install protopuf` to install)