[Library] Feed library (#4)

This PR contains the work done to setup the library and also, the necessary protocols, model, structs, and error definitions to implement remote service clients.

Reviewed-on: rock-n-code/app-reviews#4
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/Feed/Kit/Sources/Structs/ServiceConfiguration.swift

@@ -0,0 +1,29 @@
+//
+//  ServiceConfiguration.swift
+//  ReviewsiTunesKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+public struct ServiceConfiguration {
+    
+    // MARK: Constants
+    public let decoder: JSONDecoder
+    public let host: URL
+    public let session: URLSessionConfiguration
+    
+    // MARK: Initialisers
+    public init(
+        host: URL,
+        session: URLSessionConfiguration = .ephemeral,
+        decoder: JSONDecoder? = nil
+    ) {
+        self.decoder = decoder ?? .init()
+        self.host = host
+        self.session = session
+    }
+    
+}