add README

README.md

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+---
+title: Gemma Chat Demo
+emoji: 🤖
+colorFrom: blue
+colorTo: purple
+sdk: streamlit
+sdk_version: "1.30.0"
+app_file: app.py
+pinned: false
+---
+
+# Gemma Chat Demo
+
+An interactive chat application powered by Google's Gemma models using Hugging Face and Streamlit.
+
+## Features
+
+- 🔐 Hugging Face authentication for accessing Gemma models
+- 🤖 Support for multiple Gemma model variants (2B, 7B, base and instruction-tuned)
+- 🔄 Task selection for different conversation types:
+  - Question Answering
+  - Text Generation
+  - Code Completion
+- 💬 Clean chat interface with message history
+- 🧹 Option to clear chat history
+
+## Usage
+
+1. Log in with your Hugging Face token in the sidebar
+2. Select your preferred Gemma model
+3. Choose a task type for your conversation
+4. Start chatting with the model!
+
+## Requirements
+
+- Python 3.8+
+- Hugging Face account with access to Gemma models
+- Dependencies listed in requirements.txt
+
+## Running Locally
+
+```bash
+# Install dependencies
+pip install -r requirements.txt
+
+# Run the application
+python app.py
+```
+
+Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference