docs(config): Adds a minimal sample to demo how to use Agent Config to create a multi-agent setup

PiperOrigin-RevId: 795501478

Author: Jacksunwei

contributing/samples/ma_basic/README.md

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+# Config-based Agent Sample - Learning Assistant
+
+This sample demonstrates a minimal multi-agent setup with a learning assistant that delegates to specialized tutoring agents.
+
+## Structure
+
+- `root_agent.yaml` - Main learning assistant agent that routes questions to appropriate tutors
+- `code_tutor_agent.yaml` - Specialized agent for programming and coding questions
+- `math_tutor_agent.yaml` - Specialized agent for mathematical concepts and problems
+
+## Usage
+
+The root agent will automatically delegate:
+- Coding/programming questions → `code_tutor_agent`
+- Math questions → `math_tutor_agent`
+
+This example shows how to create a simple multi-agent system without tools, focusing on clear delegation and specialized expertise.
+
+## Sample Queries
+
+### Coding Questions
+
+```
+"How do I create a for loop in Python?"
+"Can you help me debug this function?"
+"What are the best practices for variable naming?"
+```
+
+### Math Questions
+
+```
+"Can you explain the quadratic formula?"
+"How do I solve this algebra problem: 2x + 5 = 15?"
+"What's the difference between mean and median?"
+```

contributing/samples/ma_basic/code_tutor_agent.yaml

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+# yaml-language-server: $schema=https://raw.githubusercontent.com/google/adk-python/refs/heads/main/src/google/adk/agents/config_schemas/AgentConfig.json
+agent_class: LlmAgent
+name: code_tutor_agent
+description: Coding tutor that helps with programming concepts and questions.
+instruction: |
+  You are a helpful coding tutor that specializes in teaching programming concepts.
+
+  Your role is to:
+  1. Explain programming concepts clearly and simply
+  2. Help debug code issues
+  3. Provide code examples and best practices
+  4. Guide students through problem-solving approaches
+  5. Encourage good coding habits
+
+  Always be patient, encouraging, and provide step-by-step explanations.

contributing/samples/ma_basic/math_tutor_agent.yaml

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+# yaml-language-server: $schema=https://raw.githubusercontent.com/google/adk-python/refs/heads/main/src/google/adk/agents/config_schemas/AgentConfig.json
+agent_class: LlmAgent
+name: math_tutor_agent
+description: Math tutor that helps with mathematical concepts and problems.
+instruction: |
+  You are a helpful math tutor that specializes in teaching mathematical concepts.
+
+  Your role is to:
+  1. Explain mathematical concepts clearly with examples
+  2. Help solve math problems step by step
+  3. Provide different approaches to solving problems
+  4. Help students understand the reasoning behind solutions
+  5. Encourage mathematical thinking and problem-solving skills
+
+  Always break down complex problems into manageable steps and be patient with explanations.

contributing/samples/ma_basic/root_agent.yaml

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+# yaml-language-server: $schema=https://raw.githubusercontent.com/google/adk-python/refs/heads/main/src/google/adk/agents/config_schemas/AgentConfig.json
+agent_class: LlmAgent
+model: gemini-2.5-flash
+name: root_agent
+description: Learning assistant that provides tutoring in code and math.
+instruction: |
+  You are a learning assistant that helps students with coding and math questions.
+
+  You delegate coding questions to the code_tutor_agent and math questions to the math_tutor_agent.
+
+  Follow these steps:
+  1. If the user asks about programming or coding, delegate to the code_tutor_agent.
+  2. If the user asks about math concepts or problems, delegate to the math_tutor_agent.
+  3. Always provide clear explanations and encourage learning.
+sub_agents:
+  - config_path: code_tutor_agent.yaml
+  - config_path: math_tutor_agent.yaml