📚 Add state management and testing guidelines documentation

Introduced new documentation files for state management and testing guidelines to enhance developer understanding and best practices.

- 📚 **Docs**: Added state management guidelines with local and global state recommendations
- 📚 **Docs**: Created testing guidelines including unit testing requirements and best practices
- 📚 **Docs**: Updated project structure documentation for clarity

.github/commit-instructions.md

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+# Commit Message Instructions
+
+## Format
+
+Each commit message should follow this structure:
+
+1. **Title**: A concise summary of the changes (max 50 characters).
+2. **Short Summary**: A brief summary of the changes (max 72 characters).
+3. **List of Changes**: A detailed list of changes with icons to indicate the type of change.
+
+---
+
+### Example
+
+```
+✨ Add user authentication module
+
+Added a new module to handle user authentication, including login and registration.
+
+- ✨ **Feature**: Implemented user login functionality
+- 🐛 **Fix**: Resolved session timeout issue
+- 🛠️ **Refactor**: Improved error handling in auth service
+- 🧪 **Test**: Added unit tests for login component
+```
+
+---
+
+## Icons for Change Types
+
+- ✨ **Feature**: New features or functionality
+- 🐛 **Fix**: Bug fixes
+- 🛠️ **Refactor**: Code improvements without changing functionality
+- 🧪 **Test**: Adding or updating tests
+- 📚 **Docs**: Documentation updates
+- 🗑️ **Chore**: Maintenance tasks (e.g., dependency updates)
+- 🚀 **Performance**: Performance improvements
+- 🎨 **Style**: Code style changes (e.g., formatting)
+- 🔒 **Security**: Security-related changes
+- ⚙️ **Config**: Configuration changes