swiftUI support done for now

Sources/EnvironmentKeys.swift

@@ -0,0 +1,45 @@
+//
+//  EnvironmentKeys.swift
+//  CoreStore
+//
+//  Created by John Rommel Estropia on 2019/10/05.
+//  Copyright © 2019 John Rommel Estropia. All rights reserved.
+//
+
+#if canImport(SwiftUI)
+
+import SwiftUI
+
+
+// MARK: - DataStackEnvironmentKey
+
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+public struct DataStackEnvironmentKey: EnvironmentKey {
+
+    // MARK: Public
+    
+    public static var defaultValue: DataStack {
+        
+        return Shared.defaultStack
+    }
+}
+
+
+// MARK: - EnvironmentValues
+
+@available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 15.0, *)
+extension EnvironmentValues {
+    
+    // MARK: Public
+    
+    public var dataStack: DataStack {
+        get {
+            return self[DataStackEnvironmentKey.self]
+        }
+        set {
+            self[DataStackEnvironmentKey.self] = newValue
+        }
+    }
+}
+
+#endif