Add AsciiDoc workshop exercises for software architecture

[raifdmueller]

This PR adds a structured workshop with exercises focused on AsciiDoc for software architecture documentation.

Contents:

Exercises

1. Setup and arc42 Template - How to initialize docToolchain and get started with arc42
2. AsciiDoc Basics - Learning AsciiDoc syntax in the context of architecture documentation
3. Diagrams with PlantUML and C4 - Creating professional architecture diagrams
4. Architecture Decisions - Documenting ADRs with Pugh matrices
5. Quality Goals and Scenarios - Creating quality trees and concrete scenarios
6. Collaboration and CI/CD - Team workflows and automation

Additional Resources

• References to helpful links and documentation
• Project ideas for participants without their own project
• Sample solution for the first exercise

Resolves docToolchain#6

The structure is designed to be easy to follow, starting with basic concepts and progressing to more advanced topics. Each exercise includes examples, explanations, and hands-on tasks with bonus challenges.

Documentation is written in AsciiDoc format to provide a practical example of what participants will be creating.

[rdmueller]

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