Imported existing sources

sketchlib/container/polygon.cpp

@@ -0,0 +1,11 @@
+#include "polygon.h"
+
+Polygon::Polygon(QObject *parent) :
+    BaseContainer(parent)
+{
+}
+
+bool Polygon::parseProperty(const QString &key, const QJsonValue &value)
+{
+    return BaseContainer::parseProperty(key, value);
+}