Update ADK doc according to issue #1292 - 1 - Skills

[adk-bot]

1. Create documentation for the new Skills Framework and SkillToolset.

Doc file: docs/agents/skills.md

Current state:

(New feature, no existing documentation)

Proposed Change:

Create a new page documenting the Skills Framework.

Include:

• Concept: Explain that Skills are modular packages of instructions and resources that agents can load on demand.
• Structure: Detail the L1 (metadata), L2 (instructions), and L3 (resources) levels.
  • SKILL.md with frontmatter and body.
  • references/, assets/, scripts/ directories.
• Usage:
  • How to define a Skill using the Skill model.
  • How to use SkillToolset to expose skills to an agent.
  • How the load_skill and load_skill_resource tools work.
• Benefits: Modular design, context window optimization (loading instructions only when needed).

Reasoning:
The Skills Framework is a major new feature introducing a structured way to build agent capabilities. It requires dedicated documentation to explain the concepts and usage.

Reference: src/google/adk/skills/models.py

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[joefernandez]

superseded by: #1313