showcase example of using cmake

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(qrcode VERSION 1.0.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Svg)
+qt_standard_project_setup()
+
+qt_add_library(qrcode
+    src/QrCodeGenerator.cpp
+    src/qrcodegen/qrcodegen.cpp
+)
+
+target_include_directories(qrcode PUBLIC src/)
+
+target_link_libraries(qrcode PRIVATE Qt6::Core Qt6::Gui Qt6::Svg)

example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(qrexample VERSION 1.0.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Widgets Gui Svg)
+qt_standard_project_setup()
+
+add_subdirectory(../ ${CMAKE_BINARY_DIR}/qrcode)
+
+qt_add_executable(qrexample
+    main.cpp
+    MainWindow.cpp
+)
+
+target_link_libraries(qrexample PRIVATE qrcode Qt6::Core Qt6::Widgets Qt6::Gui Qt6::Svg)