Add a .clang-tidy to explicitly specify the check rules.

Signed-off-by: Junwang Zhao <[email protected]>

Author: zhjwpku

.clang-tidy

@@ -0,0 +1,37 @@
+# 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.
+---
+Checks: |
+  -*,
+  clang-diagnostic-*,
+  clang-analyzer-*,
+  google-*,
+  modernize-*,
+  -modernize-use-nodiscard,
+  -modernize-use-trailing-return-type,
+
+CheckOptions:
+  - key:    google-readability-braces-around-statements.ShortStatementLines
+    value:  '1'
+  - key:    google-readability-function-size.StatementThreshold
+    value:  '800'
+  - key:    google-readability-namespace-comments.ShortNamespaceLines
+    value:  '10'
+  - key:    google-readability-namespace-comments.SpacesBeforeComments
+    value:  '2'
+
+HeaderFilterRegex: '(src|test|example)'