Implement Design patterns

[mohamed-abdelrhman]

Description
Hello,
I think this package very good resource and I thought implementing design patterns here would be a good addition to the repo.

For new implementation:

• creational
• structural
• behavioral

What do you think and is there anyone I should add to the review?

[raklaptudirm]

@mohamed-abdelrhman refer to #321

[siriak]

@mohamed-abdelrhman thanks for suggesting, but design patterns aren't something we'd like to see in this repository because it's focused on algorithms and data structures specifically. Try looking for a repo focused on design patterns.