.gitignore user setting files

Change-Id: I414032475ce1d8f76150809b1dbd3871b6e91763
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

.gitignore

+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+# qtcreator generated files
+*.pro.user*
+*.qbs.user*