Added login and setup screens

AvH Plan/LoginViewController.swift

@@ -0,0 +1,41 @@
+//
+//  LoginViewController.swift
+//  AvH Plan
+//
+//  Created by Deniz Duezgoeren on 21.09.19.
+//  Copyright © 2019 Deniz Duezgoeren. All rights reserved.
+//
+
+import UIKit
+import WebKit
+
+class LoginViewController: UIViewController, WKNavigationDelegate {
+
+    @IBOutlet weak var webView: WKWebView!
+    let prefs = UserDefaults.standard
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        let request = URLRequest(url: URL(string: "https://307.joomla.schule.bremen.de/index.php/component/users/#top")!)
+        self.webView.load(request)
+        self.webView.navigationDelegate = self
+    }
+    
+    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+        self.webView.configuration.websiteDataStore.httpCookieStore.getAllCookies { cookies in
+            for cookie in cookies {
+                if cookie.name == "joomla_user_state" && cookie.value == "logged_in" {
+                    self.success()
+                }
+            }
+        }
+    }
+    
+    private func success() {
+        self.prefs.set(true, forKey: "logged_in")
+        if let s = storyboard?.instantiateViewController(withIdentifier: "FirstTime") as? UINavigationController {
+            self.present(s, animated: true)
+        }
+    }
+}