Added GoldFish Card Game smart contract

[ShwetKhatri2001]

Description

Added a smart contract for gold fish card game

Fixes #122

Developer's checklist

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-check on my work

If changes are made in the code:

• [x] I have followed the coding guidelines
• [x] My changes in code generate no new warnings
• [x] My changes are not breaking another fix/feature of the project
• [x] I have added test cases or have tested the feature locally to show that my feature works
• [ ] I have added relevant screenshots in my PR ( Not required )