[FLINK-17512] Send issues and pull request notifications to issues@flink.apache.org

This closes #334.
diff --git a/.asf.yaml b/.asf.yaml
new file mode 100644
index 0000000..aad8df8
--- /dev/null
+++ b/.asf.yaml
@@ -0,0 +1,5 @@
+notifications:
+    commits:      commits@flink.apache.org
+    issues:       issues@flink.apache.org
+    pullrequests: issues@flink.apache.org
+    jira_options: link label