feat: added new question type

QuizApp/Topic.swift

@@ -13,16 +13,39 @@ struct QuizQuestion: Decodable, Hashable, Identifiable {
     let answers: [String]
     let correctAnswer: Int
     
+    let type: String?
+    let minValue: Double?
+    let maxValue: Double?
+    let correctValue: Double?
+    let unit: String?
+
     // Manuelles Decoding, id wird generiert
     init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
+        
         question = try container.decode(String.self, forKey: .question)
-        answers = try container.decode([String].self, forKey: .answers)
-        correctAnswer = try container.decode(Int.self, forKey: .correctAnswer)
+        
+        // Falls im JSON nicht vorhanden, Standard setzen
+        answers = (try? container.decode([String].self, forKey: .answers)) ?? []
+        correctAnswer = (try? container.decode(Int.self, forKey: .correctAnswer)) ?? 0
+        
+        // Optional
+        type = try container.decodeIfPresent(String.self, forKey: .type)
+        minValue = try container.decodeIfPresent(Double.self, forKey: .minValue)
+        maxValue = try container.decodeIfPresent(Double.self, forKey: .maxValue)
+        correctValue = try container.decodeIfPresent(Double.self, forKey: .correctValue)
+        unit = try container.decodeIfPresent(String.self, forKey: .unit)
+        
         id = UUID()
     }
     
     private enum CodingKeys: String, CodingKey {
         case question, answers, correctAnswer
+        case type, minValue, maxValue, correctValue, unit
+    }
+    
+    var isEstimation: Bool {
+        if let t = type?.lowercased() { return t == "estimation" }
+        return !answers.isEmpty ? false : (minValue != nil || maxValue != nil || correctValue != nil)
     }
 }

QuizApp/data.json

@@ -182,5 +182,23 @@
             ],
             "correctAnswer": 1
         }
+    ],
+    "Schätzen": [
+      {
+        "type": "estimation",
+        "question": "Wie hoch ist der Eiffelturm?",
+        "minValue": 0,
+        "maxValue": 1000,
+        "correctValue": 330,
+        "unit": "m"
+      },
+      {
+        "type": "estimation",
+        "question": "In welchem Jahr begann der Bau des Kölner Doms?",
+        "minValue": 1000,
+        "maxValue": 2025,
+        "correctValue": 1248,
+        "unit": "Jahr"
+      }
     ]
 }