- Adding code comments

- Removing blank spaces

swift/Sources/GildedRose/Items/AgedBrieItem.swift

@@ -12,6 +12,7 @@ struct AgedBrieItem: CustomisedItem, ItemStateUpdater{
     var item: Item
     
     private var isItemUnderHighestQuality: Bool {
+        // Returns true if quality of item is less than Hightest Quality(50)
         return item.quality < ValueConstants.kHightestQualityValue
     }
     

swift/Sources/GildedRose/Items/BackstagePassesItem.swift

@@ -12,10 +12,12 @@ struct BackstagePassesItem: CustomisedItem, ItemStateUpdater {
     var item: Item
     
     private var isItemUnderHighestQuality: Bool {
+        // Returns true if Item Quality is less than Highest value (50)
         return item.quality < ValueConstants.kHightestQualityValue
     }
     
     private var isSellInDatePassed: Bool{
+        // Returns true if sell in date is passed
         return item.sellIn < 0
     }
     

swift/Sources/GildedRose/Items/StandardItem.swift

@@ -11,6 +11,7 @@ class StandardItem: CustomisedItem, ItemStateUpdater {
     var item: Item
     
     private var isSellInDatePassed: Bool{
+        // Returns true if the sellin date is passed
         return item.sellIn < 0 
     }
     
@@ -22,6 +23,7 @@ class StandardItem: CustomisedItem, ItemStateUpdater {
     }
     
     private  var isItemMoreThanLowestQuality: Bool {
+        // Returns true if Quality of item is more than lowest quality(0)
         return item.quality > ValueConstants.kLowestQualityValue
     }
     

swift/Sources/GildedRose/Protocols/CustomisedItem.swift

@@ -8,6 +8,6 @@
 import Foundation
 
 protocol CustomisedItem {
-    var item: Item {get set}
+    var item: Item { get set }
     func updateItemState()
 }