Add a .mailmap file

Check `git shortlog` with and without this file.

.mailmap

@@ -0,0 +1,28 @@
+#
+# This list is used by git-shortlog to aggregate contributions.  It is
+# necessary when either the author's full name is not always written
+# the same way, and/or the same author contributes from different
+# email addresses.
+#
+
+Kevin Kadosh <[email protected]>
+Kevin Kadosh <[email protected]>
+Kevin Kadosh <[email protected]> kka <[email protected]>
+
+Mathieu Deous <[email protected]> MatToufoutu <[email protected]>
+Mathieu Deous <[email protected]> Mathieu D <[email protected]>
+
+Sebastien Blot <[email protected]> blotus <[email protected]>
+
+Sylvain "caillou" Lefevre <[email protected]>
+Sylvain "caillou" Lefevre <[email protected]> <[email protected]>
+
+Thibault "bui" Koechlin <[email protected]> <[email protected]>
+Thibault "bui" Koechlin <[email protected]> bui <[email protected]>
+
+Julien "jvoisin" Voisin <[email protected]> jvoisin <[email protected]>
+Julien "jvoisin" Voisin <[email protected]>
+Julien "jvoisin" Voisin <[email protected]>
+Julien "jvoisin" Voisin <[email protected]>
+Julien "jvoisin" Voisin <[email protected]>
+