Added Swift Package Manager Installation Ability

Package.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "SwiftDictionaryCoding",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "SwiftDictionaryCoding",
+            targets: ["SwiftDictionaryCoding"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "SwiftDictionaryCoding",
+            dependencies: [],
+            path: "SwiftDictionaryCoding/Classes"),
+        // .testTarget(
+        //     name: "SwiftDictionaryCodingTests",
+        //     dependencies: ["SwiftDictionaryCoding"]),
+    ]
+)

README.md

@@ -19,26 +19,40 @@ struct Event: Codable {
 
 let event = Event(id: 1, eventName: "Christmas", location: nil, price: 10)
 let encoder = DictionaryEncoder()
-let dict = try encoder.encode(event) 
+let dict = try encoder.encode(event)
 ```
 
 ### Decoding
 ```Swift
-let dict: [String: Any] = ["id": 1, "eventName": "Christmas", "price": 10]        
+let dict: [String: Any] = ["id": 1, "eventName": "Christmas", "price": 10]
 let decoder = DictionaryDecoder()
 let event = try decoder.decode(Event.self, from: dict))
 ```
 
 
 ## Installation
 
+### CocoaPods
+
 SwiftDictionaryCoding is available through [CocoaPods](https://cocoapods.org). To install
 it, simply add the following line to your Podfile:
 
 ```ruby
 pod 'SwiftDictionaryCoding'
 ```
 
+### Swift Package Manager
+
+SwiftDictionaryCoding is available through [Swift Package Manager](https://swift.org/package-manager/).
+
+Add the following dependency in your Package.swift to install:
+
+```swift
+dependencies: [
+    .package(url: "https://github.com/ashleymills/SwiftDictionaryCoding.git", from: "1.0.0")
+]
+```
+
 ## Author
 
 ashleymills, ashleymills@mac.com