This help guides Huawei engineers to add or modify the license announcement
during the development.

In the case that you add a new file, the text below should be added in the head.
    Copyright 2019 Huawei Technologies Co.,Ltd.

    Licensed 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.
    

In the case that you modify one existing file, the text below should be added after
the exiting license.
      Huawei has modified this source file.

            Copyright 2019 Huawei Technologies Co., Ltd.                                        

            Licensed 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.    
