Update Contributing.md File and Add Use Case UML Diagrams for /slash Commands

[shubhamsinghbundela]

Updating Contributing.md file of discord-slash-commands

Overview

The current Contributing.md file in the RDS Discord-slash-command repository requires modification to provide clearer instructions and improve the overall contribution process.

User stories

• As a contributor, Contributing.md file should provide clear and concise instructions and make it easier for us to understand the project and contribute effectively.

Requirements

• Review the current Contributing.md file in the project repository.
• Identify areas that need improvement, such as unclear instructions or missing information.
• Modify the Contributing.md file to address the identified issues and enhance its readability.

Acceptance Criteria

• [ ] As a contributor, we need well-formatted contributing guidelines.

[shubhamsinghbundela]