Initial commit.

Packages/Infrastructure/Sources/Public/Protocols/LocalizedRequestContext.swift

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+import Hummingbird
+
+/// A request context that carries the language negotiated for the request.
+///
+/// ``LocalizationMiddleware`` resolves the visitor's preferred language from the `Accept-Language` header and stores it here, so downstream
+/// controllers and middleware can serve the matching localization without re-reading the header.
+public protocol LocalizedRequestContext: RequestContext {
+
+    // MARK: Properties
+
+    /// The language identifier negotiated for the request.
+    var language: String { get set }
+
+}