📚 Update ExampleUser for wiki parity

Examples/EasyFirebaseExample_iOS/ExampleUser.swift

@@ -10,7 +10,34 @@
 import EasyFirebase
 
 class ExampleUser: EasyUser {
+
   var favoriteFood: String = ""
   var age: Int = -1
   var hasJob: Bool = false
+
+  // Implementation
+
+  enum CodingKeys: String, CodingKey {
+    case favoriteFood, age, hasJob
+  }
+
+  override func encode(to encoder: Encoder) throws {
+    try super.encode(to: encoder)
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    try container.encode(favoriteFood, forKey: .favoriteFood)
+    try container.encode(age, forKey: .age)
+    try container.encode(hasJob, forKey: .hasJob)
+  }
+
+  required init(from decoder: Decoder) throws {
+    try super.init(from: decoder)
+    let values = try decoder.container(keyedBy: CodingKeys.self)
+    favoriteFood = try values.decode(String.self, forKey: .favoriteFood)
+    age = try values.decode(Int.self, forKey: .age)
+    hasJob = try values.decode(Bool.self, forKey: .hasJob)
+  }
+
+  required init() {
+    super.init()
+  }
 }