Added 8 New Slangs Starting with 'Z'

[shubhdhungana]

Description

Description:
Included 8 new slang abbreviations starting with the letter 'Z' in the JSON files under the slangs directory. These additions enhance the dataset by covering commonly used informal expressions related to 'Z' words. Each slang is well-defined, providing more comprehensive and diverse slang options for applications or projects utilizing this dataset.