add top level readme

Author: sebsto

README.md

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+# Amazon Bedrock Swift Library and web playground
+
+This repository contains projects demonstrating how to use Amazon Bedrock with Swift.
+
+## Projects
+
+### 1. Swift Bedrock Library
+
+A tiny layer on top of the [AWS SDK for Swift](https://github.com/awslabs/aws-sdk-swift) for interacting with Amazon Bedrock foundation models. This library provides a convenient way to access Amazon Bedrock's capabilities from Swift applications.
+
+[Go to Swift Bedrock Library →](swift-bedrock-library/README.md)
+
+### 2. Swift FM Playground
+
+An interactive web application that demonstrates the capabilities of Amazon Bedrock foundation models using the Swift Bedrock Library. The playground includes:
+
+- A Swift "backend for frontend" that interfaces with Amazon Bedrock
+- A React frontend for interacting with the models through a user-friendly interface
+
+[Go to Swift FM Playground →](swift-fm-playground/web-playground/README.md)
+
+## Getting Started
+
+Each project has its own README with specific setup instructions:
+
+- For the Swift Bedrock Library, see the [library README](swift-bedrock-library/README.md)
+- For the Swift FM Playground, see the [playground README](swift-fm-playground/web-playground/README.md)
+
+## Prerequisites
+
+- Swift 6.0 or later
+- AWS account with access to Amazon Bedrock
+- [AWS credentials configured locally](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html) or [SSO configured with AWS Identity Center](https://docs.aws.amazon.com/singlesignon/latest/userguide/manage-your-accounts.html) configured
+
+## License
+
+These projects are licensed under the Apache License 2.0. See the LICENSE files in each project for details.