[add] propertyWrapper in swift keywords

README.md

@@ -124,7 +124,18 @@
 >    Dependancy injection\
 >    Notification center
 >
-> **[Swift Keywords](https://github.com/RinniSwift/Computer-Science-with-iOS/blob/main/swiftKeywords.md)**
+> **[Swift Keywords](https://github.com/RinniSwift/Computer-Science-with-iOS/blob/main/swiftKeywords.md)**\
+>    `@objc`\
+>    `@escaping`\
+>    `@available`\
+>    `@final`\
+>    `@discardableResult`\
+>    `@propertyWrapper`\
+>    Declarations\
+>    Type aliases\
+>    Stored Type Properties and Computed Properties\
+>    Instance Properties and Type Properties\
+>    Identifiers
 >
 > **[Collection Protocols](https://github.com/RinniSwift/Computer-Science-with-iOS/blob/main/collectionProtocols.md)**
 >

swiftKeywords.md

@@ -7,7 +7,7 @@
 - `available`
 - `final`
 - `@discardableResult`
-
+- `@propertyWrapper`
 - `instance properties` and `type properties`
 - `class` and `static`
 - `lazy` stored properties
@@ -23,6 +23,33 @@ Add this attribute when declaring a function with a return type but telling the
 
 This will make it available to call directly without needing to store in a variable.
 
+### `@propertyWrapper`
+Introduced in Swift 5.1, this enables property values to be wrapped by using a custom type. Here's an example use case:
+
+```swift
+@propertyWrapper
+struct Trimmed {
+    private var str: String = ""
+    var wrappedValue: String {
+        get {
+            str
+        }
+        set {
+            str = newValue.trimmingCharacters(in: .whiteSpacesAndNewLines)
+        }
+    }
+    init(wrappedValue: String) {
+        self.wrappedValue = wrappedValue
+    }
+}
+
+@Trimmed var firstName = ""
+@Trimmed var lastName = ""
+```
+*code snippet from Mastering Swift 5.3 - Sixth Addition by Jon Hoffman*
+
+Now when setting the `firstName` and `lastName` variables, it will automatically remove the white spaces.
+
 ---
 
 ## Declarations