📚 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

docs/guidelines/project-structur.md

@@ -0,0 +1,44 @@
+
+## Project Structure
+
+### Directory Organization
+
+```
+ISA-Frontend/
+├── apps/                  # Main applications
+│   └── isa-app/          # Primary application
+├── libs/                  # Shared libraries
+│   ├── feature/          # Feature libraries with business logic
+│   ├── ui/               # Reusable UI components
+│   ├── core/             # Core functionality
+│   └── shared/           # Cross-cutting concerns
+├── generated/            # Generated API clients
+└── docs/                # Documentation
+```
+
+### Library Types
+
+- **Feature Libraries** (`libs/feature/*`)
+
+  - Smart components
+  - Business logic
+  - Route configurations
+  - Feature-specific services
+
+- **UI Libraries** (`libs/ui/*`)
+
+  - Presentational components
+  - Pure functions
+  - No dependencies on feature libraries
+
+- **Core Libraries** (`libs/core/*`)
+
+  - Authentication
+  - Guards
+  - Interceptors
+  - Core services
+
+- **Shared Libraries** (`libs/shared/*`)
+  - Common utilities
+  - Shared interfaces
+  - Common pipes and directives