Add mailmap for contributors

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

Author: SISheogorath

.mailmap

@@ -0,0 +1,14 @@
+Max Wu <jackymaxj@gmail.com>                 Wu Cheng-Han <jacky_cute0808@hotmail.com>
+Max Wu <jackymaxj@gmail.com>                 Cheng-Han, Wu <jackymaxj@gmail.com>
+Max Wu <jackymaxj@gmail.com>                 jackycute <jackymaxj@gmail.com>
+Max Wu <jackymaxj@gmail.com>                 Wu, Cheng-Han <jackymaxj@gmail.com>
+Max Wu <jackymaxj@gmail.com>                 jackycute <jacky_cute0808@hotmail.com>
+
+Sheogorath <sheogorath@shivering-isles.com>  Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
+
+Raccoon <raccoon@hackmd.io>                  Raccoon Li <a60814billy@gmail.com>
+Raccoon <raccoon@hackmd.io>                  Raccoon <a60814billy@gmail.com>
+
+Peter Dave Hello <hsu@peterdavehello.org>    Peter Dave Hello <PeterDaveHello@users.noreply.github.com>
+
+Claudius Coenen <github@amenthes.de>         Claudius Coenen <opensource@amenthes.de>