Update the readme

Author: dreampiggy

README.md

@@ -4,6 +4,7 @@
 [![Version](https://img.shields.io/cocoapods/v/SDWebImageWebPCoder.svg?style=flat)](http://cocoapods.org/pods/SDWebImageWebPCoder)
 [![License](https://img.shields.io/cocoapods/l/SDWebImageWebPCoder.svg?style=flat)](http://cocoapods.org/pods/SDWebImageWebPCoder)
 [![Platform](https://img.shields.io/cocoapods/p/SDWebImageWebPCoder.svg?style=flat)](http://cocoapods.org/pods/SDWebImageWebPCoder)
+[![SwiftPM compatible](https://img.shields.io/badge/SwiftPM-compatible-brightgreen.svg?style=flat)](https://swift.org/package-manager/)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/SDWebImage/SDWebImageWebPCoder)
 
 Starting with the SDWebImage 5.0 version, we moved the WebP support code and [libwebp](https://github.com/webmproject/libwebp) from the Core Repo to this stand-alone repo.
@@ -35,6 +36,18 @@ SDWebImageWebPCoder is available through [Carthage](https://github.com/Carthage/
 github "SDWebImage/SDWebImageWebPCoder"
 ```
 
+#### Swift Package Manager (Xcode 11+)
+
+SDWebImageWebPCoder is available through [Swift Package Manager](https://swift.org/package-manager).
+
+```swift
+let package = Package(
+    dependencies: [
+        .package(url: "https://github.com/SDWebImage/SDWebImageWebPCoder.git", from: "0.3.0")
+    ]
+)
+```
+
 ## Usage
 
 ### Add Coder