initial protocol and implementation

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

EmployeeDirectory/Protocols/EmployeeServiceProtocol.swift

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+//
+//  EmployeeServiceable.swift
+//  EmployeeDirectory
+//
+//  Created by Matt Bruce on 1/20/25.
+//
+
+public protocol EmployeeServiceProtocol {
+    func getEmployees() async throws -> [Employee]
+}

EmployeeDirectory/Services/EmployeeService.swift

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+//
+//  EmployeeService.swift
+//  EmployeeDirectory
+//
+//  Created by Matt Bruce on 1/20/25.
+//
+import Foundation
+
+
+/// Service Layer for Employees
+public class EmployeeService: EmployeeServiceProtocol {
+    
+    /// Service to get Employees
+    /// - Returns: Array of Employee Structs
+    public func getEmployees() async throws -> [Employee] {
+        let employees: Employees = try await NetworkService.shared.fetchData(from: "https://jsonplaceholder.typicode.com/users", as: Employees.self)
+        return employees.employees
+    }
+}