Feature improve maintainability

[motola]

Description

Added comprehensive KDoc documentation throughout the codebase to improve code maintainability and developer onboarding. All documentation follows Kotlin standards and provides clear explanations of classes, interfaces, functions, and their parameters.

Changes Made

Build Configuration (buildSrc/)

• Documented all build configuration constants and version numbers
• Added descriptions for Gradle plugins and module paths
• Explained library dependencies and their purposes

Data Source Layer (artist-datasource/)

• Documented MusicBrainz API service endpoints and parameters
• Added KDoc for all API response models and mappers
• Explained remote data source implementation

Data Layer (artist-data/)

• Documented data source interface and repository implementation
• Added descriptions for data transfer objects
• Explained data-to-domain model transformations

Domain Layer (artist-domain/)

• Documented repository interfaces and domain models
• Added KDoc for domain entities (partial completion)

Documentation

• Updated README with clearer module descriptions
• Added concise tech stack overview and getting started guide

Type of Change

• Documentation update
• Code quality improvement
• No functional changes

Testing

• All existing tests pass
• Code compiles successfully across all modules
• No breaking changes introduced

Documentation Coverage

• Completed: buildSrc, artist-datasource, artist-data
• In Progress: artist-domain
• Pending: artist-presentation, artist-ui, app

Notes

This PR focuses on improving code clarity without changing functionality. Documentation is consistent across modules and makes the clean architecture patterns more explicit.