:saprkles: Adding CoreData Helper Classes

- Also adding lecturer entity and relationship between event and lecturers.
- Preparation for CoreData refactoring

DHBW-Service/CoreData/Models/Lecturer+CoreDataClass.swift

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+//
+//  Lecturer+CoreDataClass.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+@objc(Lecturer)
+public class Lecturer: NSManagedObject {
+    @nonobjc public class func getAll() -> [Lecturer] {
+        let managedContext =
+            PersistenceController.shared.context
+        
+        do {
+            return try managedContext.fetch(Lecturer.fetchRequest())
+        } catch let error as NSError {
+            print("Could not fetch. \(error), \(error.userInfo)")
+            return []
+        }
+    }
+}

DHBW-Service/CoreData/Models/Lecturer+CoreDataProperties.swift

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+//
+//  Lecturer+CoreDataProperties.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+
+extension Lecturer {
+
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<Lecturer> {
+        return NSFetchRequest<Lecturer>(entityName: "Lecturer")
+    }
+
+    @NSManaged public var email: String?
+    @NSManaged public var name: String?
+    @NSManaged public var event: RaPlaEvent?
+
+}
+
+extension Lecturer : Identifiable {
+
+}

DHBW-Service/CoreData/Models/RaPlaEvent+CoreDataClass.swift

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+//
+//  RaPlaEvent+CoreDataClass.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+@objc(RaPlaEvent)
+public class RaPlaEvent: NSManagedObject {
+    @nonobjc public class func getAll() -> [RaPlaEvent] {
+        let managedContext =
+            PersistenceController.shared.context
+        
+        do {
+            return try managedContext.fetch(RaPlaEvent.fetchRequest())
+        } catch let error as NSError {
+            print("Could not fetch. \(error), \(error.userInfo)")
+            return []
+        }
+    }
+}

DHBW-Service/CoreData/Models/RaPlaEvent+CoreDataProperties.swift

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+//
+//  RaPlaEvent+CoreDataProperties.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+
+extension RaPlaEvent {
+
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<RaPlaEvent> {
+        return NSFetchRequest<RaPlaEvent>(entityName: "RaPlaEvent")
+    }
+
+    @NSManaged public var category: String?
+    @NSManaged public var descr: String?
+    @NSManaged public var endDate: Date?
+    @NSManaged public var isHidden: Bool
+    @NSManaged public var location: String?
+    @NSManaged public var startDate: Date?
+    @NSManaged public var summary: String?
+    @NSManaged public var uid: String?
+    @NSManaged public var lecturers: NSSet?
+
+}
+
+// MARK: Generated accessors for lecturers
+extension RaPlaEvent {
+
+    @objc(addLecturersObject:)
+    @NSManaged public func addToLecturers(_ value: Lecturer)
+
+    @objc(removeLecturersObject:)
+    @NSManaged public func removeFromLecturers(_ value: Lecturer)
+
+    @objc(addLecturers:)
+    @NSManaged public func addToLecturers(_ values: NSSet)
+
+    @objc(removeLecturers:)
+    @NSManaged public func removeFromLecturers(_ values: NSSet)
+
+}
+
+extension RaPlaEvent : Identifiable {
+
+}

DHBW-Service/CoreData/Models/User+CoreDataClass.swift

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+//
+//  User+CoreDataClass.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+@objc(User)
+public class User: NSManagedObject {
+    @nonobjc public class func getAll() -> [User] {
+        let managedContext =
+            PersistenceController.shared.context
+        
+        do {
+            return try managedContext.fetch(User.fetchRequest())
+        } catch let error as NSError {
+            print("Could not fetch. \(error), \(error.userInfo)")
+            return []
+        }
+    }
+}

DHBW-Service/CoreData/Models/User+CoreDataProperties.swift

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+//
+//  User+CoreDataProperties.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 10.02.21.
+//
+//
+
+import Foundation
+import CoreData
+
+
+extension User {
+
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<User> {
+        return NSFetchRequest<User>(entityName: "User")
+    }
+
+    @NSManaged public var course: String?
+    @NSManaged public var director: String?
+    @NSManaged public var name: String?
+
+}
+
+extension User : Identifiable {
+
+}