feat: add initial Windows desktop platform support files and configuration.

windows/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,14 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+#include <video_player_win/video_player_win_plugin_c_api.h>
+
+void RegisterPlugins(flutter::PluginRegistry* registry) {
+  VideoPlayerWinPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("VideoPlayerWinPluginCApi"));
+}