chore: adk Add more documentations for ADK live feature in ADK.md

Also added commit message guidelines.

PiperOrigin-RevId: 783450329

Author: hangfei

AGENTS.md

@@ -10,6 +10,15 @@ The Agent Development Kit (ADK) is an open-source, code-first Python toolkit for
 
 Please refer to [ADK Project Overview and Architecture](https://github.com/google/adk-python/blob/main/contributing/adk_project_overview_and_architecture.md) for details.
 
+### ADK Live (Bidi-streaming)
+
+- ADK live feature can be accessed from runner.run_live(...) and corresponding FAST api endpoint.
+- ADK live feature is built on top of [Gemini Live API](https://cloud.google.com/vertex-ai/generative-ai/docs/live-api). We integrate Gemini Live API through [GenAI SDK](https://github.com/googleapis/python-genai).
+- ADK live related configs are in [run_config.py](https://github.com/google/adk-python/blob/main/src/google/adk/agents/run_config.py).
+- ADK live under multi-agent scenario: we convert the audio into text. This text will be passed to next agent as context.
+- Most logics are in [base_llm_flow.py](https://github.com/google/adk-python/blob/main/src/google/adk/flows/llm_flows/base_llm_flow.py) and [gemini_llm_connection.py](https://github.com/google/adk-python/blob/main/src/google/adk/models/gemini_llm_connection.py).
+- Tests are in [tests/unittests/streaming](https://github.com/google/adk-python/tree/main/tests/unittests/streaming).
+
 ## ADK: Style Guides
 
 ### Python Style Guide
@@ -200,4 +209,11 @@ The following changes are considered breaking and necessitate a MAJOR version
  (e.g., the switch from snake_case to camelCase for all JSON payloads).
 
 - Dependency Removal: Removing support for a previously integrated third-party
- library or tool type.
+ library or tool type.
+
+## Commit Message Format
+
+- Please use [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/)
+format.
+- If it's not a breaking change, please add #non-breaking tag. If it's a
+breaking change, please add #breaking.