doc: libvlc: add a CMake makefile to build the win32 samples

CMake has good integration with VSCode which makes it as easy as just loading
the folder in VSCode, set the SDK folder and build.

doc/libvlc/CMakeLists.txt

+CMAKE_MINIMUM_REQUIRED(VERSION 3.0)
+
+# configure with your own path
+#  -DLIBVLC_SDK_INC:STRING=S:/sources/build/win64/win64/vlc-4.0.0-dev/sdk/include
+#  -DLIBVLC_SDK_LIB:STRING=S:/sources/build/win64/win64/vlc-4.0.0-dev/sdk/lib
+#
+# or set them in your VSCode settings
+# {
+#     "cmake.configureSettings": {
+#         "LIBVLC_SDK_INC": "S:/sources/vlc/include",
+#         "LIBVLC_SDK_LIB": "S:/sources/build/win64/win64/lib/.libs"
+#     }
+# }
+
+set("LIBVLC_SDK_INC" "" CACHE PATH "libvlc include folder, containing the vlc/ includes")
+set("LIBVLC_SDK_LIB" "" CACHE PATH "libvlc library folder, containing the libvlc libraries")
+
+project("libvlc samples")
+
+# define the libvlc external build
+add_library(libvlc SHARED IMPORTED GLOBAL)
+target_include_directories(libvlc INTERFACE "${LIBVLC_SDK_INC}")
+if (MSVC)
+    set_target_properties(libvlc PROPERTIES IMPORTED_IMPLIB "${LIBVLC_SDK_LIB}/libvlc.lib")
+else ()
+    set_target_properties(libvlc PROPERTIES IMPORTED_IMPLIB "${LIBVLC_SDK_LIB}/libvlc.dll.a")
+endif ()
+
+if(WIN32)
+
+    add_executable(d3d9_player WIN32 d3d9_player.c)
+    target_link_libraries(d3d9_player libvlc d3d9)
+
+    add_executable(d3d11_player WIN32 d3d11_player.cpp)
+    target_compile_definitions(d3d11_player PRIVATE _WIN32_WINNT=0x0601)
+    target_link_libraries(d3d11_player libvlc d3d11 d3dcompiler uuid)
+
+    add_executable(win_player WIN32 win_player.c)
+    target_link_libraries(win_player libvlc)
+
+endif()