Added initial POC version of NetNewsWire for iOS to use as a starting point for the actual app.

iOS/Add Feed/FolderTreeControllerDelegate.swift

@@ -0,0 +1,43 @@
+//
+//  FolderTreeControllerDelegate.swift
+//  NetNewsWire
+//
+//  Created by Brent Simmons on 8/10/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+import Foundation
+import RSCore
+import RSTree
+import Articles
+import Account
+
+final class FolderTreeControllerDelegate: TreeControllerDelegate {
+	
+	func treeController(treeController: TreeController, childNodesFor node: Node) -> [Node]? {
+
+		return node.isRoot ? childNodesForRootNode(node) : nil
+	}
+}
+
+private extension FolderTreeControllerDelegate {
+	
+	func childNodesForRootNode(_ node: Node) -> [Node]? {
+		
+		// Root node is “Top Level” and children are folders. Folders can’t have subfolders.
+		// This will have to be revised later.
+
+		guard let folders = AccountManager.shared.localAccount.folders else {
+			return nil
+		}
+		let folderNodes = folders.map { createNode($0, parent: node) }
+		return folderNodes.sortedAlphabetically()
+	}
+
+	func createNode(_ folder: Folder, parent: Node) -> Node {
+		
+		let node = Node(representedObject: folder, parent: parent)
+		node.canHaveChildNodes = false
+		return node
+	}
+}