Adds .gitignore for QT

Adding a .gitignore file for QT projects tells git to ignore the .user file generated by QT Creator.  This .gitignore file was taken from https://github.com/github/gitignore/blob/master/Qt.gitignore

.gitignore

@@ -0,0 +1,35 @@
+# C++ objects and libs
+
+*.slo
+*.lo
+*.o
+*.a
+*.la
+*.lai
+*.so
+*.dll
+*.dylib
+
+# Qt-es
+
+/.qmake.cache
+/.qmake.stash
+*.pro.user
+*.pro.user.*
+*.qbs.user
+*.qbs.user.*
+*.moc
+moc_*.cpp
+qrc_*.cpp
+ui_*.h
+Makefile*
+*-build-*
+
+# QtCreator
+
+*.autosave
+
+#QtCtreator Qml
+*.qmlproject.user
+*.qmlproject.user.*
+