adds README

Author: joshgrenon

README.md

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+# PerplexityApiSwift
+
+PerplexityApiSwift is a Swift framework that provides a convenient wrapper for the Perplexity AI API. This framework simplifies the process of making chat completion requests to Perplexity's advanced language models.
+
+## Features
+
+- Easy-to-use Swift interface for the Perplexity AI API
+- Support for multiple Perplexity AI models
+- Asynchronous API calls using Swift's modern concurrency features
+- Built-in error handling for common API issues
+
+## Quick Start
+
+1. Initialize the API client with your token:
+   ```swift
+   let api = PerplexityAPI(token: "your_api_token_here")
+   ```
+
+2. Make a chat completion request:
+   ```swift
+   let messages = [Message(role: "user", content: "Hello, AI!")]
+   let response = try await api.chatCompletion(messages: messages, model: .sonarLarge)
+   ```
+
+## Models
+
+The framework supports various Perplexity AI models, including:
+- Sonar (small, medium, large)
+- CodeLlama-34b
+- Llama-2-70b
+- Mistral-7b
+- Mixtral-8x7b
+
+## Documentation
+
+For detailed information about the Perplexity AI API, including available endpoints, request/response formats, and model capabilities, please refer to the official documentation:
+
+[Perplexity AI API Documentation](https://docs.perplexity.ai/)
+
+## License
+
+[Add your license information here]
+
+## Contributing
+
+[Add contribution guidelines if applicable]