[KE] Add assistant description (#469)

## Problem

There were no info on assistant in the readme

## Solution

Now there is info on assistant in the readme

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [x] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

Describe specific steps for validating this change.

Author: avi1mizrahi

README.md

@@ -189,6 +189,17 @@ response = index.search_records(
 )
 ```
 
+## Pinecone Assistant
+### Installing the Pinecone Assistant Python plugin
+
+To interact with Pinecone Assistant using the Python SDK, install the `pinecone-plugin-assistant` package:
+
+```shell
+pip install --upgrade pinecone pinecone-plugin-assistant
+```
+For more information on Pinecone Assistant, see the [Pinecone Assistant documentation](https://docs.pinecone.io/guides/assistant/overview).
+
+
 ## More information on usage
 
 Detailed information on specific ways of using the SDK are covered in these other pages.