Update index.md (#19941)

docs/genai/index.md

@@ -9,10 +9,11 @@ nav_order: 6
 
 _Note: this API is in preview and is subject to change._
 
-Run generative AI models with ONNX Runtime.
+Run generative AI models with ONNX Runtime. Source code: https://github.com/microsoft/onnxruntime-genai 
 
 This library provides the generative AI loop for ONNX models, including inference with ONNX Runtime, logits processing, search and sampling, and KV cache management.
 
 Users can call a high level `generate()` method, or run each iteration of the model in a loop, generating one token at a time, and optionally updating generation parameters inside the loop.
 
 It has support for greedy/beam search and TopP, TopK sampling to generate token sequences and built-in logits processing like repetition penalties. You can also easily add custom scoring.
+