Clarify license and copyright

[ci skiip]

Author: nakamura-to

README.md

@@ -80,6 +80,20 @@ Major versions
 License
 -------
 
-Apache License, Version 2.0
+```
+Copyright 2019 domaframework.org
+
+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.
+```
 
   [apt]: https://www.jcp.org/en/jsr/detail?id=269