[Hacktoberfest] Add more design patterns

[Devansh-Maurya]

Add more design patterns that are currently not present in the repo. Please mention here if you want any pattern to be added. Required language is Kotlin

[guggens]

added a new PR for builder pattern, hacktoberfest style. hope it helps

[Devansh-Maurya]

Thanks @guggens !
Will look into it tomorrow.