Created Building with Qt (markdown)

Building-with-Qt.md

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+# Linux and OS X
+Use -DENABLE_QT2 when calling cmake:  
+cmake .. -DENABLE_QT2=true
+
+# Windows
+Not supported, waiting on a PR to be merged.
+
+# Notes
+*    Ensure that Qt5 is installed
+*    Using -DENABLE_LTO=true will break the Qt build