chore: add headers for sfc playground

yyx990803 · yyx990803 · commit 8772a01a9280 · 2022-09-13T16:27:44.000+08:00
diff --git a/packages/sfc-playground/public/_headers b/packages/sfc-playground/public/_headers
@@ -0,0 +1,6 @@
+/*
+  X-Frame-Options: DENY
+
+/assets/*
+  cache-control: max-age=31536000
+  cache-control: immutable
