Added DependencyInjector as simple dependency injection framework

ui/BankingiOSApp/BankingiOSApp/ui/DependencyInjector.swift

@@ -0,0 +1,25 @@
+/**
+ Code copied from Hannes Hertach, https://medium.com/@hanneshertach/swiftui-dependency-injection-in-20-lines-b322457065a5
+ */
+struct DependencyInjector {
+    private static var dependencyList: [String:Any] = [:]
+    
+    static func resolve<T>() -> T {
+        guard let t = dependencyList[String(describing: T.self)] as? T else {
+            fatalError("No povider registered for type \(T.self)")
+        }
+        return t
+    }
+    
+    static func register<T>(dependency: T) {
+        dependencyList[String(describing: T.self)] = dependency
+    }
+}
+
+@propertyWrapper struct Inject<T> {
+    var wrappedValue: T
+    
+    init() {
+        self.wrappedValue = DependencyInjector.resolve()
+    }
+}