Add mailmap, for better "git shortlog -nse"

ctrueden · ctrueden · commit 26cf1f37b246 · 2022-09-23T08:24:48.000-05:00
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1,2 @@
+Jack Yuan <yuan88@wisc.edu> <55564584+yongleyuan@users.noreply.github.com>
+Tobias Pietzsch <tobias.pietzsch@gmail.com>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Jack Yuan <yuan88@wisc.edu> <55564584+yongleyuan@users.noreply.github.com>`
	`2`	`+Tobias Pietzsch <tobias.pietzsch@gmail.com>`