add readme

README.md

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+![DominoKit](https://raw.githubusercontent.com/jarrodparkes/DominoKit/assets/domino-kit.png "Domino Kit")
+
+<img src="https://img.shields.io/badge/os-mac | linux-blue.svg?style=flat" alt="Mac and Linux" />
+<a href="https://raw.githubusercontent.com/jarrodparkes/DominoKit/master/LICENSE"><img src="http://img.shields.io/badge/license-MIT-blue.svg?style=flat" alt="License: MIT" /></a>
+<a href="https://developer.apple.com/swift"><img src="https://img.shields.io/badge/swift3-compatible-orange.svg?style=flat" alt="Swift 3 Compatible" /></a>
+
+## Summary
+
+DominoKit is a Swift library for creating applications with dominoes.
+
+## Installation
+
+Using the Swift Package Manager, ensure the DominoKit is included in the dependencies section of `Package.swift`:
+
+```swift
+let package = Package(
+    name: "MyProject",
+    dependencies: [
+        .Package(url: "https://github.com/jarrodparkes/DominoKit.git", majorVersion: 1),
+        ...
+    ]
+    ...
+)
+```
+
+## Usage
+
+```swift
+import DominoKit
+
+let sixEight = Domino(suitOne: .six, suitTwo: .eight)
+print(sixEight) // "[06|08]"
+print(sixEight.suitOne) // "06"
+print(sixEight.suitTwo) // "08"
+print(sixEight.isDouble) // false
+print(sixEight.isSingle) // true
+print(sixEight.rank) // 14
+
+let doubleSix = Domino(doubleSuit: .six)
+print(sixEight.hasMatchingSuit(withDomino: doubleSix)) // true
+```