added new information

[dignat]

Pull request title

• Clearly and concisely describes what it does
• Refer to the issue that it solves, if available

Pull request description

• Describes the main changes that come with the pull request
• Any relevant additional information is provided

For detailed contributing instructions see https://github.com/iluwatar/java-design-patterns/wiki/01.-How-to-contribute

[iluwatar]

Thanks @dignat, some valuable points there