Examples: Add README for HelloWorldWithResources

Author: euanh

Examples/HelloWorldWithResources/README.md

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+# HelloWorldWithResources
+
+This example shows you how to use a resource bundle in your service.   It builds a Hummingbird server which returns a randomly-selected image from its resource bundle.
+
+1. [Install the correct Static Linux SDK](https://www.swift.org/documentation/articles/static-linux-getting-started.html) for your Swift compiler.  For instance, this command installs the Static Linux SDK for Swift 6.1:
+
+    % swift sdk install https://download.swift.org/swift-6.1-release/static-sdk/swift-6.1-RELEASE/swift-6.1-RELEASE_static-linux-0.0.1.artifactbundle.tar.gz --checksum https://www.swift.org/documentation/articles/static-linux-getting-started.html
+
+2. Build the service and upload it to a container registry:
+
+    % swift package --swift-sdk aarch64-swift-linux-musl --allow-network-connections all build-container-image --repository registry.example.com/resources
+
+3. Run the service:
+
+    % podman run -it --rm -p 8080:8080 registry.example.com/resources
+
+4. Access the service [from your browser](localhost:8080/).   It should return a random emoji chosen from the three images stored in the bundle.