Update README.md

README.md

@@ -2,15 +2,16 @@
 
 [![Swift Package Manager compatible](https://img.shields.io/badge/SPM-compatible-brightgreen.svg)](https://github.com/apple/swift-package-manager)
 
-Async image loading with cache for SwiftUI.
+Async image loading with progress and cache for SwiftUI.
 
 ## Screenshots
 ![](./demo.png)
 
 ## Installation
 ### [Swift Package Manager](https://swift.org/package-manager/)
 
-Going to Xcode `File` > `Add Packages...` and add the repository by giving the URL `https://github.com/bullinnyc/CachedAsyncImage`  
+Going to Xcode `File` > `Add Packages...` and add the repository by giving the URL  
+`https://github.com/bullinnyc/CachedAsyncImage`  
 Enjoy!
 
 ## Usage
@@ -19,7 +20,7 @@ Enjoy!
 import CachedAsyncImage
 ```
 
-### Create any view for placeholder and customize image
+### Quick start
 **Note:** `placeholder` is an optional parameter.
 
 ```swift
@@ -28,7 +29,7 @@ let exampleUrl = "https://example.com/image.jpg"
 CachedAsyncImage(
     url: exampleUrl,
     placeholder: {
-        // Create any view for placeholder.
+        // Create any view for placeholder (optional).
         ZStack {
             Color.yellow
             ProgressView()
@@ -43,6 +44,53 @@ CachedAsyncImage(
 )
 ```
 
+### Use it to the fullest
+**Note:** `placeholder` and `error` is an optional parameters.
+
+```swift
+let exampleUrl = "https://example.com/image.jpg"
+
+CachedAsyncImage(
+    url: exampleUrl,
+    placeholder: { progress in
+        // Create any view for placeholder (optional).
+        ZStack {
+            Color.yellow
+
+            ProgressView() {
+                VStack {
+                    Text("Downloading...")
+                    Text("\(progress) %")
+                }
+            }
+        }
+    },
+    image: {
+        // Customize image.
+        Image(uiImage: $0)
+            .resizable()
+            .scaledToFill()
+    },
+    error: { error in
+        // Create any view for error (optional).
+        ZStack {
+            Color.yellow
+
+            VStack {
+                Text("Error:")
+                    .bold()
+
+                Text(error)
+            }
+            .font(.footnote)
+            .multilineTextAlignment(.center)
+            .foregroundColor(.red)
+            .frame(width: 120)
+        }
+    }
+)
+```
+
 ### Set image cache limit (optional)
 **Note:** The default value is `0`, e.g. is no count limit and is no total cost limit.