add .asf.yaml to configure github metadata (#69)

.asf.yaml

+#
+# 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.
+#
+
+github:
+  description: "Apache OpenWhisk Runtime Python supports Apache OpenWhisk functions written in Python"
+  homepage: https://openwhisk.apache.org/
+  labels:
+  - openwhisk
+  - apache
+  - serverless
+  - faas
+  - functions-as-a-service
+  - cloud
+  - serverless-architectures
+  - serverless-functions
+  - docker
+  - functions
+  - openwhisk-runtime
+  - python