first implementation of legend

src/i0mmonplot.cpp

@@ -4,6 +4,7 @@
 #include <quplotcurve.h>
 #include <qutimescaledraw.h>
 #include <qwt_symbol.h>
+#include <qwt_legend.h>
 #include <qwt_date_scale_engine.h>
 
 #include <cupluginloader.h>
@@ -42,6 +43,7 @@ I0MMonPlot::I0MMonPlot(QWidget *parent, CumbiaPool *cup, const CuControlsFactory
 
     setXAxisAutoscaleEnabled(false);
     setYAxisAutoscaleEnabled(false);
+    insertLegend( new QwtLegend() );
 }
 
 I0MMonPlot::~I0MMonPlot() {