feat: add example plugin
diff --git a/src/plugins/say.py b/src/plugins/say.py
new file mode 100644
index 0000000..d64f952
--- /dev/null
+++ b/src/plugins/say.py
@@ -0,0 +1,28 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import runner.plugin.base
+from runner.http.request import Request
+from runner.http.response import Response
+
+
+class Say(runner.plugin.base.Base):
+    def __init__(self):
+        super(Say, self).__init__(self.__class__.__name__)
+
+    def filter(self, request: Request, response: Response):
+        response.setHeader("X-Resp-A6-Runner", "Python")
+        response.setBody("Hello, Python Runner of APISIX")