Add .gitattributes to mark generated Rust files as generated (#1150)

Author: jnbooth

crates/cxx-qt-lib/.gitattributes

@@ -0,0 +1,9 @@
+# SPDX-FileCopyrightText: 2021 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+# SPDX-FileContributor: Joshua Booth <[email protected]>
+#
+# SPDX-License-Identifier: MIT OR Apache-2.0
+
+src/core/qlist/qlist_*.rs linguist-generated=true
+src/core/qset/qset_*.rs linguist-generated=true
+src/core/qvariant/qvariant_*.rs linguist-generated=true
+src/core/qvector/qvector_*.rs linguist-generated=true