Update OpenAIAsyncImage.swift

Author: swiftuiux

Sources/openai-async-image-swiftui/OpenAIAsyncImage.swift

@@ -32,6 +32,7 @@ public struct OpenAIAsyncImage<Content: View, T: IOpenAILoader>: View {
 
     // MARK: - Config
 
+    /// A text description of the desired image(s). The maximum length is 1000 characters
     @Binding var prompt : String
 
     /// Custom loader