set branch protection
diff --git a/.asf.yaml b/.asf.yaml
new file mode 100644
index 0000000..ecfec2c
--- /dev/null
+++ b/.asf.yaml
@@ -0,0 +1,4 @@
+github:
+  protected_branches:
+    master:
+      foo: bar
\ No newline at end of file