Add security policy (#27822)

TomAugspurger · web-flow · commit 7bfa9b85bf3b · 2019-08-09T09:18:53.000-05:00
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
@@ -0,0 +1 @@
+To report a security vulnerability to pandas, please go to https://tidelift.com/security and see the instructions there.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+To report a security vulnerability to pandas, please go to https://tidelift.com/security and see the instructions there.`