title: Set a default value for a property with defined getter and setter
body: <p>I have a very simple class</p>
  
  <pre><code>class SimpleClass {
      var simpleDescription: String {
      get {
          return self.simpleDescription
      }
      set {
          self.simpleDescription = newValue
      }
      }
  }
  </code></pre>
  
  <p>What is the correct way to define a default value for the <code>simpleDescription</code> variable?</p>