Add banner with screenshot to Readme

Author: icereed

README.md

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 [![License](https://img.shields.io/github/license/icereed/paperless-gpt)](LICENSE)
 [![Docker Pulls](https://img.shields.io/docker/pulls/icereed/paperless-gpt)](https://hub.docker.com/r/icereed/paperless-gpt)
 
+![Screenshot](./paperless-gpt-screenshot.png)
+
 **paperless-gpt** is a tool designed to generate accurate and meaningful document titles for [paperless-ngx](https://github.com/paperless-ngx/paperless-ngx) using Large Language Models (LLMs). It supports multiple LLM providers, including **OpenAI** and **Ollama**. With paperless-gpt, you can streamline your document management by automatically suggesting appropriate titles and tags based on the content of your scanned documents.
 
 [![Demo](./demo.gif)](./demo.gif)