Create starter project templates/archetypes

[pgatzka]

User Story

As a developer, I want starter templates so that I can quickly bootstrap a new project using Graphite.

Description

Create starter project templates:

Templates to create:

1. Gradle Starter

   • Minimal Gradle project with Graphite configured
   • Example schema and generated code
   • Basic tests

2. Maven Archetype

   • Maven archetype for quick project generation
   • Same structure as Gradle starter

3. Enhanced Examples

   • Expand examples/ directory
   • Full working examples with different use cases

Acceptance Criteria

• Gradle starter template created
• Maven archetype created
• Templates tested and verified working
• Installation instructions documented
• Examples directory expanded
• Implemented code is covered with automated tests
• Documentation has been updated