[GSSOC'23] Add ZigZag Pattern in Pattern Directory

[bhartik021]

This commit adds a new ZigZag pattern code implementation to the Pattern directory. The ZigZag pattern is a popular design that creates a visually appealing and dynamic effect. The code generates a ZigZag pattern using asterisks (*) and spaces, allowing users to specify the size and number of repetitions. This addition enhances the collection of patterns available in the directory and provides users with more options for their projects or applications.

[bhartik021]

Please assign this issue to me under GSSoC'23