Add CMake support

CMakeLists.txt

@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.7)
+
+project(QTaskbarControl VERSION 2.0.0 LANGUAGES CXX)
+
+set(CMAKE_AUTOMOC ON)
+
+add_library(${PROJECT_NAME}
+    qtaskbarcontrol.cpp
+    qtaskbarcontrol_p.cpp
+)
+
+find_package(Qt5 COMPONENTS Widgets REQUIRED)
+target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::Widgets)
+
+if(UNIX AND NOT APPLE AND NOT ANDROID)
+    target_sources(${PROJECT_NAME} PRIVATE qtaskbarcontrol_x11.cpp)
+
+    find_package(Qt5 COMPONENTS DBus REQUIRED)
+    target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::DBus)
+elseif(WIN32)
+    set(CMAKE_AUTORCC ON)
+
+    target_sources(${PROJECT_NAME} PRIVATE
+        qtaskbarcontrol_win.cpp
+        qtaskbarcontrol.qrc
+    )
+
+    find_package(Qt5 COMPONENTS WinExtras REQUIRED)
+    target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::WinExtras)
+elseif(APPLE AND NOT IOS)
+    target_sources(${PROJECT_NAME} PRIVATE qtaskbarcontrol_mac.mm)
+
+    find_package(Qt COMPONENTS MacExtras REQUIRED)
+    find_library(APPKIT_LIBRARY AppKit)
+    target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::MacExtras ${APPKIT_LIBRARY})
+else()
+    target_sources(${PROJECT_NAME} PRIVATE qtaskbarcontrol_dummy.cpp)
+endif()
+
+target_compile_definitions(${PROJECT_NAME} PUBLIC Q_TASKBAR_CONTROL_EXPORT=)
+target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})