Initial WindowGrid KWin effect for Plasma 6

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CMakeLists.txt

@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.20)
+project(kwin-windowgrid VERSION 0.1.0 LANGUAGES CXX)
+
+set(QT_MIN_VERSION "6.8.0")
+set(KF6_MIN_VERSION "6.10.0")
+
+find_package(ECM ${KF6_MIN_VERSION} REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
+
+include(KDEInstallDirs)
+include(KDECMakeSettings)
+include(KDECompilerSettings NO_POLICY_SCOPE)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_AUTOMOC ON)
+
+find_package(Qt6 ${QT_MIN_VERSION} REQUIRED COMPONENTS Core Gui OpenGL)
+find_package(KF6 ${KF6_MIN_VERSION} REQUIRED COMPONENTS ConfigGui CoreAddons)
+find_package(KWin REQUIRED COMPONENTS kwineffects)
+find_package(epoxy REQUIRED)
+
+kcoreaddons_add_plugin(windowgrid
+    INSTALL_NAMESPACE "kwin/effects/plugins"
+    SOURCES main.cpp windowgrid.cpp windowgrid.h
+)
+
+target_link_libraries(windowgrid PRIVATE
+    KWin::kwin
+    KF6::ConfigGui
+    KF6::CoreAddons
+    Qt6::Core
+    Qt6::Gui
+    Qt6::OpenGL
+    epoxy::epoxy
+)