Fix UV command (#474)

## Problem

`uv add` instead of `uv install`

Author: Gareth

README.md

@@ -47,10 +47,10 @@ pip3 install "pinecone[asyncio,grpc]"
 
 ```shell
 # Install the latest version
-uv install pinecone
+uv add pinecone
 
 # Install the latest version, optional dependencies
-uv install "pinecone[asyncio,grpc]"
+uv add "pinecone[asyncio,grpc]"
 ```
 
 #### Installing with [poetry](https://python-poetry.org/)