feat: add node edges

src/gui/network/NodeEdgeGraphic.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <QGraphicsItem>
+#include "gui/network/SocketGraphic.h"
+
+#include <QPainter>
+
+class NodeEdgeGraphic
+: public QGraphicsItem
+{
+public:
+    NodeEdgeGraphic(SocketGraphic* socket1, SocketGraphic* socket2, QGraphicsItem *parent = nullptr);
+    QRectF boundingRect() const override;
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+
+private:
+    SocketGraphic* socket1_;
+    SocketGraphic* socket2_;
+};
+