Add a gitignore file for project

.gitignore

+# the default generated dir + db file
+data
+owncloud
+
+# just sane ignores
+.*.sw[po]
+*.bak
+*.BAK
+*~
+*.orig
+*.class
+.cvsignore
+Thumbs.db
+*.py[co]
+_darcs/*
+CVS/*
+.svn/*
+RCS/*