exa[patch]: update readme (#18047)

libs/partners/exa/README.md

@@ -1 +1,28 @@
 # langchain-exa
+
+This package contains the LangChain integrations for Exa Cloud generative models.
+
+## Installation
+
+```bash
+pip install -U langchain-exa
+```
+
+## Exa Search Retriever
+
+You can retrieve search results as follows
+
+```python
+from langchain_exa import ExaSearchRetriever
+
+exa_api_key = "YOUR API KEY"
+
+# Create a new instance of the ExaSearchRetriever
+exa = ExaSearchRetriever(exa_api_key=exa_api_key)
+
+# Search for a query and save the results
+results  = exa.get_relevant_documents(query="What is the capital of France?")
+
+# Print the results
+print(results)
+```