[#4] chore: Extension 파일 추가

Author: sungju-kim

iOS/TodoList/Util/Extension.swift

@@ -0,0 +1,8 @@
+import Foundation
+import UIKit
+
+extension UIScreen {
+    var isPortrait : Bool {
+        return self.bounds.width < self.bounds.height
+    }
+}

iOS/TodoList/Xib/TaskCardListView.xib

@@ -7,7 +7,12 @@
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
-        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="TaskCardListViewController" customModule="TodoList" customModuleProvider="target"/>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="TaskCardListViewController" customModule="TodoList" customModuleProvider="target">
+            <connections>
+                <outlet property="taskCardList" destination="iN0-l3-epB" id="E4h-XI-lgP"/>
+                <outlet property="view" destination="iN0-l3-epB" id="Hf6-21-LBu"/>
+            </connections>
+        </placeholder>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
         <view contentMode="scaleToFill" id="iN0-l3-epB" customClass="TaskCardListView" customModule="TodoList" customModuleProvider="target">
             <rect key="frame" x="0.0" y="0.0" width="495" height="375"/>