Added a ModelSummary class to make the overview over the model content accessible via QProperty system & a SummaryWidget to show this information. Only property rowCount as a proof of concept. Other properties will follow.

UIs/BeetRoundWidgets/widgets/summarywidget.h

@@ -0,0 +1,21 @@
+#ifndef SUMMARYWIDGET_H
+#define SUMMARYWIDGET_H
+
+#include <QWidget>
+
+class ModelSummary;
+class QLabel;
+
+class SummaryWidget : public QWidget {
+  Q_OBJECT
+
+ public:
+  explicit SummaryWidget(std::shared_ptr<ModelSummary> modelSummary, QWidget* parent = nullptr);
+
+ private:
+  std::shared_ptr<ModelSummary> m_modelSummary;
+
+  QLabel* m_rowCoundValueLabel;
+};
+
+#endif  // SUMMARYWIDGET_H