Add directory tree to docs folder

Co-authored-by: hiyouga <16256802+hiyouga@users.noreply.github.com>

Author: Copilot

docs/DIRECTORY_TREE.md

@@ -0,0 +1,54 @@
+# Directory Tree
+
+This document shows the overall structure of the AgentAdapter repository.
+
+```
+.
+├── LICENSE
+├── README.md
+├── docs/
+│   ├── claude4_5/
+│   │   ├── docs/          # Claude 4.5 documentation files
+│   │   ├── examples/      # Claude 4.5 example code
+│   │   ├── readme.python.md
+│   │   └── readme.typescript.md
+│   ├── gemini3/
+│   │   ├── docs/          # Gemini 3 documentation files
+│   │   ├── readme.python.md
+│   │   └── readme.typescript.md
+│   └── gpt5_2/
+│       ├── docs/          # GPT-5.2 documentation files
+│       ├── examples/      # GPT-5.2 example code
+│       ├── readme.python.md
+│       └── readme.typescript.md
+├── src_py/
+│   ├── Makefile
+│   ├── agent_adapter/
+│   │   ├── __init__.py
+│   │   └── hello_world.py
+│   ├── pyproject.toml
+│   └── tests/
+│       └── test_hello_world.py
+└── src_ts/
+    ├── Makefile
+    ├── eslint.config.cjs
+    ├── package-lock.json
+    ├── package.json
+    ├── src/
+    │   └── index.ts
+    └── tsconfig.json
+```
+
+## Directory Structure Overview
+
+- **docs/** - Documentation for different AI model adapters
+  - **claude4_5/** - Claude 4.5 API documentation and examples
+  - **gemini3/** - Gemini 3 API documentation and examples
+  - **gpt5_2/** - GPT-5.2 API documentation and examples
+  
+- **src_py/** - Python package source code
+  - **agent_adapter/** - Main Python package
+  - **tests/** - Python test files
+  
+- **src_ts/** - TypeScript package source code
+  - **src/** - TypeScript source files