Add README.md with usage instructions

README.md

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+# OpenRouter MCP Multimodal Server
+
+An MCP (Model Context Protocol) server that provides chat and image analysis capabilities through OpenRouter.ai's diverse model ecosystem. This server combines text chat functionality with powerful image analysis capabilities.
+
+## Features
+
+- **Text Chat:**
+  - Direct access to all OpenRouter.ai chat models
+  - Support for simple text and multimodal conversations
+  - Configurable temperature and other parameters
+
+- **Image Analysis:**
+  - Analyze single images with custom questions
+  - Process multiple images simultaneously 
+  - Automatic image resizing and optimization
+  - Support for various image sources (local files, URLs, data URLs)
+
+- **Model Selection:**
+  - Search and filter available models
+  - Validate model IDs
+  - Get detailed model information
+  - Support for default model configuration
+
+- **Performance Optimization:**
+  - Smart model information caching
+  - Exponential backoff for retries
+  - Automatic rate limit handling
+
+## Installation
+
+```bash
+npm install @stabgan/openrouter-mcp-multimodal
+```
+
+## Configuration
+
+### Prerequisites
+
+1. Get your OpenRouter API key from [OpenRouter Keys](https://openrouter.ai/keys)
+2. Choose a default model (optional)
+
+### Setup
+
+Add the server to your MCP settings file (e.g., `cline_mcp_settings.json` or `claude_desktop_config.json`):
+
+```json
+{
+  "mcpServers": {
+    "openrouter_multimodal": {
+      "command": "npx",
+      "args": ["@stabgan/openrouter-mcp-multimodal"],
+      "env": {
+        "OPENROUTER_API_KEY": "your-api-key-here",
+        "OPENROUTER_DEFAULT_MODEL": "optional-default-model"
+      }
+    }
+  }
+}
+```
+
+## Available Tools
+
+### chat_completion
+
+Send text or multimodal messages to OpenRouter models:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "chat_completion",
+  arguments: {
+    model: "google/gemini-2.5-pro-exp-03-25:free", // Optional if default is set
+    messages: [
+      {
+        role: "system",
+        content: "You are a helpful assistant."
+      },
+      {
+        role: "user",
+        content: "What is the capital of France?"
+      }
+    ],
+    temperature: 0.7 // Optional, defaults to 1.0
+  }
+});
+```
+
+For multimodal messages with images:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "chat_completion",
+  arguments: {
+    model: "anthropic/claude-3.5-sonnet",
+    messages: [
+      {
+        role: "user",
+        content: [
+          {
+            type: "text",
+            text: "What's in this image?"
+          },
+          {
+            type: "image_url",
+            image_url: {
+              url: "https://example.com/image.jpg"
+            }
+          }
+        ]
+      }
+    ]
+  }
+});
+```
+
+### analyze_image
+
+Analyze a single image with an optional question:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "analyze_image",
+  arguments: {
+    image_path: "/absolute/path/to/image.jpg",
+    question: "What objects are in this image?", // Optional
+    model: "anthropic/claude-3.5-sonnet" // Optional if default is set
+  }
+});
+```
+
+### multi_image_analysis
+
+Analyze multiple images with a single prompt:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "multi_image_analysis",
+  arguments: {
+    images: [
+      { url: "https://example.com/image1.jpg" },
+      { url: "file:///absolute/path/to/image2.jpg" },
+      { 
+        url: "https://example.com/image3.jpg",
+        alt: "Optional description of image 3" 
+      }
+    ],
+    prompt: "Compare these images and tell me their similarities and differences",
+    markdown_response: true, // Optional, defaults to true
+    model: "anthropic/claude-3-opus" // Optional if default is set
+  }
+});
+```
+
+### search_models
+
+Search and filter available models:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "search_models",
+  arguments: {
+    query: "claude", // Optional text search
+    provider: "anthropic", // Optional provider filter
+    capabilities: {
+      vision: true // Filter for models with vision capabilities
+    },
+    limit: 5 // Optional, defaults to 10
+  }
+});
+```
+
+### get_model_info
+
+Get detailed information about a specific model:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "get_model_info",
+  arguments: {
+    model: "anthropic/claude-3.5-sonnet"
+  }
+});
+```
+
+### validate_model
+
+Check if a model ID is valid:
+
+```javascript
+use_mcp_tool({
+  server_name: "openrouter_multimodal",
+  tool_name: "validate_model",
+  arguments: {
+    model: "google/gemini-2.5-pro-exp-03-25:free"
+  }
+});
+```
+
+## Error Handling
+
+The server provides detailed error messages for various failure cases:
+
+- Invalid input parameters
+- Network errors
+- Rate limiting issues
+- Invalid image formats
+- Authentication problems
+
+## Development
+
+To build from source:
+
+```bash
+git clone https://github.com/stabgan/openrouter-mcp-multimodal.git
+cd openrouter-mcp-multimodal
+npm install
+npm run build
+```
+
+## License
+
+MIT License