feat: basic geometry spreadsheet model

src/Gui/GeometrySpreadsheetPanel/GeometrySpreadsheetModel.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <QAbstractListModel>
+
+class GeometrySpreadsheetModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    GeometrySpreadsheetModel(const QStringList &strings, QObject *parent = nullptr)
+        : QAbstractListModel(parent), stringList(strings) {}
+
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+    QVariant headerData(int section, Qt::Orientation orientation,
+                        int role = Qt::DisplayRole) const override;
+
+private:
+    QStringList stringList;
+};