Fix - [FEAT]: Add piece model

[gadyrcdz]

📝 Pull Request Title

🛠️ Issue

• Closes [FEAT]: Add piece model #14

📖 Description

• A new model was successfully created to store relevant data for a piece. This model includes the following attributes:
• player → Primary Key
• id → Primary Key
• color → String (felt252)

✅ Changes made

• Created a new model to store piece-related data.
• Ensured the model includes the specified attributes.

🖼️ Media (screenshots/videos)

📜 Additional Notes