extending README

Author: chr-hertel

README.md

@@ -1,4 +1,28 @@
 SymfonyCon Bot 2023
 ===================
 
-Chatbot for SymfonyCon 2023
+Chatbot for SymfonyCon 2023 with Telegram integration.
+
+Use it on Telegram: [@SymfonyConBot](https://t.me/SymfonyConBot)
+
+What's it about?
+----------------
+
+This bot is a small demo app for the SymfonyCon 2023 conference.
+It's a simple bot that can be used to get information about the conference.
+It knows a few things about the conference, like the dates, the location, and
+the schedule.
+
+The bot demonstrates a simple way to implement Retrieval Augmented Generation
+(RAG) with Symfony and OpenAI's API.
+
+Requirements
+------------
+
+* PHP 8.2
+* Doctrine compatible database engine
+* [Symfony CLI](https://symfony.com/doc/master/cloud/getting-started#installing-the-cli-tool) (or sth similar)
+* [Ngrok](https://ngrok.com/download) (or sth similar)
+* [Telegram Bot Token](https://core.telegram.org/bots#6-botfather)
+* [OpenAI API Key](https://platform.openai.com/docs/overview)
+* [Pinecone API](https://www.pinecone.io/)