Add adk module: two LlmAgents in a SequentialAgent with a tool and shared session state on Google ADK for Java 1.11.0

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth

README.md

@@ -11,6 +11,7 @@ facts, so the build fails when a claim stops being true.
 | `onnx-djl` | Running ONNX Models in Java with ONNX Runtime and DJL | a DistilBERT sentiment model: DJL tokenizer, ONNX Runtime directly and through DJL's engine, batching, and a Spring Boot endpoint with latency numbers |
 | `jlama` | Local LLM Inference in Pure Java with Jlama | load and run a 4-bit TinyLlama inside the JVM on the Vector API, tokens per second, streaming, and the same measurement against Ollama |
 | `langgraph4j` | LangGraph4j: Stateful Agent Graphs in Java | a loan-approval graph with conditional edges, checkpoints, a human-in-the-loop pause and resume, and the `releaseThread` default that erases a finished run |
+| `adk` | Google ADK for Java: Your First Multi-Agent App | two `LlmAgent`s in a `SequentialAgent`, a tool call, session state handed from one agent to the next, with a scripted stand-in model |
 
 ## Versions (verified on Maven Central, 2026-10-11)
 
@@ -25,6 +26,7 @@ facts, so the build fails when a claim stops being true.
 | Spring Boot | 4.1.1 | `onnx-djl` endpoint only |
 | Model | `distilbert/distilbert-base-uncased-finetuned-sst-2-english` | `onnx/model.onnx` (268 MB), `onnx/tokenizer.json`, `config.json` in `onnx-djl/models/sst2/` (git-ignored) |
 | LangGraph4j `org.bsc.langgraph4j:langgraph4j-core` | 1.9.5 | verified on Maven Central 2026-10-14; `langgraph4j` module only |
+| Google ADK `com.google.adk:google-adk` | 1.11.0 | verified on Maven Central 2026-10-14; `adk` module only; no Gemini key needed |
 | JDK | 25 LTS | |
 | JUnit | 6.1.3 | |