Add cmake config file

Big thanks for @madebr who made all work

skeleton/CMakeLists.txt

@@ -0,0 +1,46 @@
+add_library(librw_skeleton
+        glfw.cpp
+        skeleton.cpp
+        skeleton.h
+        win.cpp
+    )
+
+set_target_properties(librw_skeleton
+    PROPERTIES
+        PREFIX ""
+    )
+
+target_link_libraries(librw_skeleton
+    PUBLIC
+        librw
+    )
+
+target_include_directories(librw_skeleton
+    INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+    )
+
+if(NOT LIBRW_PLATFORM_PS2 AND NOT LIBRW_PLATFORM_NULL)
+    add_subdirectory(imgui)
+endif()
+
+if(LIBRW_INSTALL)
+    target_include_directories(librw_skeleton
+        INTERFACE
+            $<INSTALL_INTERFACE:${LIBRW_INSTALL_INCLUDEDIR}/skeleton>
+        )
+
+    install(
+        FILES
+            skeleton.h
+        DESTINATION "${LIBRW_INSTALL_INCLUDEDIR}/skeleton"
+        )
+
+    install(
+        TARGETS librw_skeleton
+        EXPORT librw-targets
+        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        )
+endif()

skeleton/imgui/CMakeLists.txt

@@ -0,0 +1,46 @@
+add_library(librw_skeleton_imgui
+    imconfig.h
+    imgui.cpp
+    imgui_demo.cpp
+    imgui_draw.cpp
+    imgui.h
+    imgui_impl_rw.cpp
+    imgui_impl_rw.h
+    imgui_internal.h
+    ImGuizmo.cpp
+    ImGuizmo.h
+    stb_rect_pack.h
+    stb_textedit.h
+    stb_truetype.h
+    )
+
+set_target_properties(librw_skeleton_imgui
+    PROPERTIES
+        PREFIX ""
+    )
+
+target_link_libraries(librw_skeleton_imgui
+    PUBLIC
+        librw_skeleton
+    )
+
+if(LIBRW_INSTALL)
+    install(
+        FILES
+            imconfig.h
+            imgui.h
+            imgui_impl_rw.h
+            imgui_internal.h
+            ImGuizmo.h
+            stb_textedit.h
+        DESTINATION "${LIBRW_INSTALL_INCLUDEDIR}/skeleton/imgui"
+        )
+
+    install(
+        TARGETS librw_skeleton_imgui
+        EXPORT librw-targets
+        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        )
+endif()