Almost full implementation of Scanner UI. Two tests not passing, but safety commit

src/main/java/hhn/temp/project/AssignmentManager.java

@@ -17,8 +17,7 @@ public class AssignmentManager {
         taskMap = new HashMap<>();
         int workerIdCounter = 1000;
         int taskIdCounter = 0;
-        userInterface = new UserCommands();
-        userInterface.start();
+        userInterface = new UserCommands(this);
     }
 
     public int createWorker(String name) {
@@ -80,5 +79,12 @@ public class AssignmentManager {
     public UserCommands getUserCommands() {
         return userInterface;
     }
+    public void startCLI() {
+        userInterface.start();
+    }
+
+    public void stopCLI() {
+        userInterface.stop();
+    }
 
 }