bunch of stuff. very basic drag/drop now working

mainwindow.cpp

@@ -0,0 +1,15 @@
+#include "mainwindow.h"
+#include "./ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+    ui = nullptr;
+}