Update license notation

Author: cheonjaeung

README.md

@@ -62,6 +62,20 @@ Please see [changelog](./CHANGELOG.md) file.
 
 ## License
 
-Copyright 2023 Jaeung Cheon.
+```
+Copyright 2023 Cheon Jaeung
+
+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
+
+    https://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.
+```
 
 GridLayout for Compose is licensed under Apache License 2.0. See [license file](./LICENSE.txt) for more details.