startig with the Network Service layer for getting JSON and dealing with errors.

Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>

EmployeeDirectory/Services/NetworkService.swift

@@ -0,0 +1,25 @@
+//
+//  NetworkService.swift
+//  EmployeeDirectory
+//
+//  Created by Matt Bruce on 1/20/25.
+//
+
+import Foundation
+
+public enum NetworkServiceError: Error {
+    /// The response from the server was invalid (e.g., non-200 status code or malformed URL).
+    case invalidResponse
+
+    /// The url giving is invalid or malformed
+    case invalidURL
+    
+    /// The data received was invalid or could not be decoded.
+    case decodingError(DecodingError)
+    
+    /// A network-related error occurred.
+    case networkError(URLError)
+    
+    /// An unexpected, uncategorized error occurred.
+    case unknownError(Error)
+}