Update README.md

Author: VikramadityaDev

README.md

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 # Viki-2-OpenAI
+<p>
 A Chatbot chat app built using the Flutter framework and OpenAI's ChatGPT-3 and Dall.E 2 language model.
+</p>
+
+### Show some :heart: and star the repo.
+
+## Features
+
+- Natural language understanding.
+- Human-like conversation.
+- Customizable to fit your use-case.
+- Lightweight, easy to integrate with other apps.
+- Open-source.
+- High quality images.
+- Text to image.
+
+## Prerequisites
+
+- Flutter SDK
+- API key for OpenAI GPT-3 [Available here](https://beta.openai.com/account/api-keys)
+
+
+### Development by
+
+- OpenAI - https://openai.com
+- Flutter - https://flutter.dev/