SPM Support (#823)

Author: wolfcon

Package.swift

@@ -0,0 +1,30 @@
+// swift-tools-version:5.3
+
+import PackageDescription
+
+let package = Package(
+    name: "MJExtension",
+    products: [
+        .library(name: "MJExtension", targets: ["MJExtension"]),
+    ],
+    dependencies: [],
+    targets: [
+        .target(
+            name: "MJExtension",
+            dependencies: [],
+            path: "MJExtension",
+            exclude: ["Info.plist"],
+            publicHeadersPath: ".",
+            cxxSettings: [
+                .headerSearchPath("."),
+            ]
+        ),
+        // Mixed languages are not supported now. Go MJExtension project to see tests.
+//        .testTarget(
+//            name: "MJExtensionTests",
+//            dependencies: ["MJExtension"],
+//            path: "MJExtensionTests",
+//            exclude: ["Info.plist"]
+//        )
+    ]
+)

README.md

@@ -1,8 +1,10 @@
 MJExtension
 ===
+[![SPM supported](https://img.shields.io/badge/SPM-supported-4BC51D.svg?style=flat)](https://github.com/apple/swift-package-manager)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 ![podversion](https://img.shields.io/cocoapods/v/MJExtension.svg)
 ![Platform](https://img.shields.io/cocoapods/p/MJExtension.svg?style=flat)
+
 - A fast, convenient and nonintrusive conversion framework between JSON and model.
 - 转换速度快、使用简单方便的字典转模型框架
 
@@ -48,27 +50,27 @@ MJExtension
 
 ### <a id="Installation"></a> Installation【安装】
 
-#### From CocoaPods【使用CocoaPods】
+#### CocoaPods【使用CocoaPods】
 
 ```ruby
 pod 'MJExtension'
 ```
 
+#### Carthage
+
+```ruby
+github "CoderMJLee/MJExtension"
+```
+
+#### Swift Package Manager
+
+Released from [`3.4.0`](https://github.com/CoderMJLee/MJExtension/releases/)
+
 #### Manually【手动导入】
+
 - Drag all source files under folder `MJExtension` to your project.【将`MJExtension`文件夹中的所有源代码拽入项目中】
 - Import the main header file：`#import "MJExtension.h"`【导入主头文件：`#import "MJExtension.h"`】
 
-```objc
-MJExtension.h
-MJConst.h               MJConst.m
-MJFoundation.h          MJFoundation.m
-MJProperty.h            MJProperty.m
-MJType.h                MJType.m
-NSObject+MJCoding.h     NSObject+MJCoding.m
-NSObject+MJProperty.h   NSObject+MJProperty.m
-NSObject+MJKeyValue.h   NSObject+MJKeyValue.m
-```
-
 ## <a id="Examples"></a> Examples【示例】
 
 **Add `MJKeyValue` protocol to your model if needed【如果有需要, 请在模型中加入 `MJKeyValue` 协议】**