Add files from zip

playground/scaleengine/scaleengine.pro

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+######################################################################
+# Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+# This file may be used under the terms of the 3-clause BSD License
+######################################################################
+
+include( $${PWD}/../playground.pri )
+
+TARGET       = scaleengine
+
+HEADERS = \
+    TransformPlot.h \
+    Plot.h \
+    MainWindow.h
+
+SOURCES = \
+    TransformPlot.cpp \
+    Plot.cpp \
+    MainWindow.cpp \
+    main.cpp
+