Add Swift Package Manager support (#38)

Package.swift

@@ -0,0 +1,16 @@
+// swift-tools-version:5.0
+import PackageDescription
+
+let package = Package(
+    name: "KeyboardManager",
+    platforms: [.iOS(.v9)],
+    products: [
+        .library(name: "KeyboardManager", targets: ["KeyboardManager"]),
+    ],
+    targets: [
+        .target(
+            name: "KeyboardManager",
+            path: "Sources"
+        ),
+    ]
+)

README.md

@@ -35,6 +35,12 @@ github "alphatroya/KeyboardManager"
 
 Run `carthage update` to build the framework and drag the built KeyboardManager.framework into your Xcode project.
 
+### Swift Package Manager (required Xcode 11)
+
+1. Select File > Swift Packages > Add Package Dependency. Enter `https://github.com/alphatroya/KeyboardManager` in the "Choose Package Repository" dialog.
+2. In the next page, specify the version resolving rule as "Up to Next Major" with "1.4" as its earliest version.
+3. After Xcode checking out the source and resolving the version, you can choose the "KeyboardManager" library and add it to your app target.
+
 ## Author
 
 Alexey Korolev, [email protected]