added code for a network service

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

EmployeeDirectory/Services/EmployeeService.swift

@@ -43,4 +43,24 @@ public class EmployeeService: EmployeeServiceProtocol {
     }
 }
 
+public class Networkservice {
+    public static let shared = Networkservice()
+    
+    public init(){}
+    
+    public func fetch<T: Decodable>(endpoint: String, type: T.Type) async throws -> T {
+        guard let url = URL(string: endpoint) else {
+            throw URLError(.badURL)
+        }
+        
+        let (data, response) = try await URLSession.shared.data(from: url)
+        
+        guard let httpResponse = response as? HTTPURLResponse,
+              200..<300 ~= httpResponse.statusCode else {
+            throw URLError(.badServerResponse)
+        }
+        
+        return try JSONDecoder().decode(T.self, from: data)
+    }
+}