MAINT: add a .mailmap file

dnicolodi · rgommers · commit 901ce6f365aa · 2023-10-05T22:01:09.000+02:00
The added mailmap files fixes two alternative spellings of Matthias
Köppe's name and adds a name for metab0t beside the Github username.
This is useful for generating the contributors list we add to the
changelog.
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2023 The meson-python developers
+#
+# SPDX-License-Identifier: MIT
+
+Matthias Köppe <mkoeppe@math.ucdavis.edu>
+Yue Yang <metab0t@outlook.com>
