Added floor text for the keyboard visualisation.

Assets/Scenes/MidiScene.unity

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+  m_Text: 'Step onto the grey area to
+
+    activate random MIDI note
+
+    generation from the
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+    <i>Pd2MidiExample.pd</i> patch.
+
+
+    See the <i>Midi2Unity</i> script for
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+    details.'
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