Add initial .mailmap file

(cherry picked from commit 359758bb53400b589e311c7d4f8732a58a40a1cd)

.mailmap

@@ -0,0 +1,10 @@
+Camilla Löwy <[email protected]> <[email protected]>
+Camilla Löwy <[email protected]> <[email protected]>
+Camilla Löwy <[email protected]>
+
+Emmanuel Gil Peyrot <[email protected]>
+
+Marcus Geelnard <[email protected]> <[email protected]>
+Marcus Geelnard <[email protected]> <marcus@geelnards-pc.(none)>
+Marcus Geelnard <[email protected]>
+