Add .mailmap

Change-Id: I7294fa143e8b34c525e7880c61396d8e7c4d9f90
diff --git a/.mailmap b/.mailmap
new file mode 100644
index 0000000..8154169
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1 @@
+Shawn Pearce <[email protected]> Shawn O. Pearce <[email protected]>