Update README.md

Author: smuellner

README.md

@@ -1,3 +1,51 @@
 # GameKitService.swift
 
-A description of this package.
+## GameKit (GameCenter) helper for SwiftUI
+
+GameKitService is **created and maintaned with ❥** by Sascha Muellner.
+
+---
+[![Swift](https://github.com/SwiftPackageRepository/GameKitService.swift/workflows/Swift/badge.svg)](https://github.com/SwiftPackageRepository/GameKitService.swift/actions?query=workflow%3ASwift)
+[![codecov](https://codecov.io/gh/SwiftPackageRepository/GameKitService.swift/branch/main/graph/badge.svg)](https://codecov.io/gh/SwiftPackageRepository/GameKitService.swift)
+![Platforms](https://img.shields.io/badge/platform-iOS%20%7C%20macOS%20%7C%20tvOS-lightgrey.svg)
+[![License](https://img.shields.io/github/license/SwiftPackageRepository/GameKitService.swift)](https://github.com/SwiftPackageRepository/GameKitService.swift/blob/main/LICENSE)
+![Version](https://img.shields.io/github/v/tag/SwiftPackageRepository/GameKitService.swift)
+[![Swift Version](https://img.shields.io/badge/swift-5.1-orange.svg?style=flat)](https://developer.apple.com/swift)
+[![SPM compatible](https://img.shields.io/badge/SPM-compatible-orange.svg?style=flat)](https://github.com/apple/swift-package-manager)
+[![README](https://img.shields.io/badge/-README-lightgrey)](https://SwiftPackageRepository.github.io/GameKitService.swift)
+
+## What?
+This is a **Swift** package with support for iOS/macOS/tvOS that allows to use GameKit. 
+
+## Requirements
+
+The latest version of GameKitService requires:
+
+- Swift 5+
+- iOS 13+
+- Xcode 11+
+
+## Installation
+
+### Swift Package Manager
+Using SPM add the following to your dependencies
+
+``` 'GameKitService', 'master', 'https://github.com/smuellner/GameKitService.swift.git' ```
+
+## How to use?
+
+### GameCenter
+
+To au. 
+
+```swift
+
+```
+
+## Documentation
++ [Apple Documentation GameKit](https://developer.apple.com/documentation/gamekit/)
++ [raywenderlich.com: Game Center for iOS: Building a Turn-Based Game](https://www.raywenderlich.com/7544-game-center-for-ios-building-a-turn-based-game)
++ [raywenderlich.com: Game Center Tutorial: How To Make A Simple Multiplayer Game with Sprite Kit: Part 1/2](https://www.raywenderlich.com/7544-game-center-for-ios-building-a-turn-based-game)
++ [Medium: GameKit Real Time Multiplayer Tutorial](https://link.medium.com/Mwg3mSi4Ebb)
+
+