move standalone Windows file to extras

thermion_dart/extras/windows/CMakeLists.txt

@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.14)
+set(PROJECT_NAME "thermion_windows")
+project(${PROJECT_NAME} LANGUAGES C CXX)
+
+cmake_policy(VERSION 3.14...3.25)
+
+add_compile_definitions(WGL_USE_BACKING_WINDOW)
+add_compile_definitions(UNICODE)
+
+add_library(${PROJECT_NAME} SHARED
+  "thermion_window.cpp"
+)
+
+set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_20)
+target_include_directories(${PROJECT_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/include"
+  "${CMAKE_SOURCE_DIR}/../../../../thermion_dart/native/include/filament"
+  "${CMAKE_SOURCE_DIR}/../../../../thermion_dart/native/include"
+  ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE 
+ Shlwapi
+ opengl32
+ dwmapi
+ comctl32
+)
+