Adding mailmap file to unify commiter

If one wants to have different entry in the git `git shortlog`, just
give me a hint or just update it.

diff --git a/.mailmap b/.mailmap
new file mode 100644 (file)
index 0000000..d5e7ba7
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1,8 @@
+<xsdg@xsdg.org> <xsdg@google.com>
+<cclark@mcb.net> <colin.clark@cclark.uk>
+Colin Clark <cclark@mcb.net>
+<johne@verizon.net> John Ellis <gqview@users.sf.net>
+<zas@norz.org> Laurent Monin <geeqie@norz.org>
+<mschwendt@fedoraproject.org> <mschwendt@gmail.com>
+<nijel@debian.org> <mcihar@suse.cz>
+<jrs+git@weitnahbei.de> J. R. Schmid <sixtyfive@users.noreply.github.com>