add langchain example

README.md

@@ -75,6 +75,7 @@ export OPENAI_API_KEY=<your token>
 export GEMINI_API_KEY=<your token>
 export ANTHROPIC_API_KEY=<your token>
 export GROQ_API_KEY=<your token>
+export TAVILY_API_KEY=<your token>  # Required for Langchain agents
 
 # Additional Providers (as needed)
 export LUMAAI_API_KEY=<your token>
@@ -217,6 +218,20 @@ gr.load(
 ).launch()
 ```
 
+#### Langchain Agents
+```python
+import gradio as gr
+import ai_gradio
+
+# Create a Langchain agent interface
+gr.load(
+    name='langchain:gpt-4-turbo',  # or other supported models
+    src=ai_gradio.registry,
+    title='Langchain Agent',
+    description='AI agent powered by Langchain'
+).launch()
+```
+
 ## Requirements
 
 ### Core Requirements

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "ai-gradio"
-version = "0.2.12"
+version = "0.2.13"
 description = "A Python package for creating Gradio applications with AI models"
 authors = [
     { name = "AK", email = "[email protected]" }