chore: add asf yaml (#292)

## Rationale
Add `.asf.yaml`.

## Detailed Changes


## Test Plan
No need.

.asf.yaml

@@ -0,0 +1,50 @@
+# 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.
+
+# For more information, see https://cwiki.apache.org/confluence/display/INFRA/Git+-+.asf.yaml+features.
+
+github:
+  description: >-
+    Meta service of HoraeDB cluster.
+  homepage: https://apache.github.io/incubator-horaedb-docs # TODO: after website is ready, set to https://horaedb.apache.org/
+  labels:
+    - golang
+    - sql
+    - database
+    - distributed-database
+    - cloud-native
+    - tsdb
+    - timeseries-database
+    - timeseries-analysis
+    - iot-database
+    - horaedb
+  enabled_merge_buttons:
+    squash:  true
+    merge:   false
+    rebase:  true
+  protected_branches:
+    main:
+      required_pull_request_reviews:
+        dismiss_stale_reviews: true
+        required_approving_review_count: 1
+
+notifications:
+  commits:      [email protected]
+  issues:       [email protected]
+  pullrequests: [email protected]
+  jobs:         [email protected]
+  discussions:  [email protected]