adding it

Author: Howon Lee

docs/integrations/code-graph.md

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+# CodeRabbit Code Graph
+
+## What is Code Graph?
+
+Code Graph is an intelligent code analysis feature that enhances your code reviews by automatically mapping relationships between files in your codebase. By
+understanding how your code connects and interacts, Code Graph provides concrete snippets of context that makes reviews more effective and insightful.
+
+## How Code Graph Enhances Your Reviews
+
+When reviewing code with CodeRabbit, Code Graph automatically:
+
+- **Maps symbol definitions and references** across your entire codebase
+- **Analyzes commit history** to identify files that frequently change together
+- **Builds relationship graphs** showing how different parts of your code connect
+- **Enriches reviews with contextual information** about related code
+
+## Key Features
+
+### Three Types of Contextual Information
+
+Code Graph adds three powerful layers of context to your reviews:
+
+1. **Definition Files**: Files containing definitions that are referenced in the current code
+2. **Reference Files**: Files that reference symbols defined in the current code
+3. **Related Files**: Files that appear related based on usage patterns and commit history
+
+### Language Support
+
+Code Graph works with:
+
+- Bash
+- C
+- C#
+- C++
+- CSS
+- Elixir
+- Go
+- Java
+- JavaScript
+- Kotlin
+- Lua
+- PHP
+- Python
+- Ruby
+- Rust
+- Scala
+- Swift
+- TSX
+- TypeScript
+
+## Availability
+
+Code Graph is available on the Lite tier and above.
+
+---
+
+Learn more about CodeRabbit's advanced features at [coderabbit.ai](https://coderabbit.ai)