Add initial app skeleton as made by qtcreator.

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.19)
+project(SOM LANGUAGES CXX)
+
+find_package(Qt6 6.5 REQUIRED COMPONENTS Core Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(SOM
+    WIN32 MACOSX_BUNDLE
+    src/main.cpp
+    src/mainwindow.cpp
+    src/mainwindow.h
+    src/mainwindow.ui
+)
+
+target_link_libraries(SOM
+    PRIVATE
+        Qt::Core
+        Qt::Widgets
+)
+
+include(GNUInstallDirs)
+
+install(TARGETS SOM
+    BUNDLE  DESTINATION .
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+qt_generate_deploy_app_script(
+    TARGET SOM
+    OUTPUT_SCRIPT deploy_script
+    NO_UNSUPPORTED_PLATFORM_ERROR
+)
+install(SCRIPT ${deploy_script})

README.md

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+mkdir build
+cd build
+cmake ..
+make

src/main.cpp

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+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}

src/mainwindow.cpp

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}

src/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class MainWindow;
+}
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+};
+#endif // MAINWINDOW_H

src/mainwindow.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>23</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>