Add note to LICENSE.md

Author: yasulab

LICENSE.md

@@ -1,5 +1,7 @@
 MIT License
 
+:memo: **NOTE: This applies only for source codes, not logos and images. See [README#license](https://github.com/coderdojo-japan/teaser-template.coderdojo.jp#license) for details.**
+
 Copyright (c) 2024  [DojoCon Japan](https://dojocon.coderdojo.jp/) & [CoderDojo Japan](https://github.com/coderdojo-japan)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy