add shared property

commented the code

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

EmployeeDirectory/Services/EmployeeService.swift

@@ -12,6 +12,7 @@ public enum EmployeeServiceMode: String, CaseIterable {
     case malformed
     case empty
     
+    /// Enpoint in which to grabe employees from.
     public var endpoint: String {
         switch self {
         case .production:
@@ -26,11 +27,18 @@ public enum EmployeeServiceMode: String, CaseIterable {
 
 /// Service Layer for Employees
 public class EmployeeService: EmployeeServiceProtocol {
-    
+    // MARK: - Properties
+    public static let shared = EmployeeService() // Default shared instance
+
+    // MARK: - Initializer
+
     public init() {}
     
-    /// Service to get Employees
-    /// - Returns: Array of Employee Structs
+    // MARK: - Public Methods
+
+    /// This will get a list of all employees
+    /// - Parameter serviceMode: Mode in which to hit.
+    /// - Returns: An Employees struct
     public func getEmployees(_ serviceMode: EmployeeServiceMode = .production) async throws -> Employees {
         return try await NetworkService.shared.fetchData(from: serviceMode.endpoint, as: Employees.self)
     }