CB-12339: handle re-open app window

 This closes #39
diff --git a/bin/templates/project/__PROJECT_NAME__/Classes/AppDelegate.m b/bin/templates/project/__PROJECT_NAME__/Classes/AppDelegate.m
index 9a463e0..510ee44 100644
--- a/bin/templates/project/__PROJECT_NAME__/Classes/AppDelegate.m
+++ b/bin/templates/project/__PROJECT_NAME__/Classes/AppDelegate.m
@@ -44,4 +44,14 @@
 
 }
 
+- (BOOL)applicationShouldHandleReopen:(NSApplication *)app hasVisibleWindows:(BOOL)visibleWindows
+{
+  if (visibleWindows) {
+    [self.window orderFront:self];
+  } else {
+    [self.window makeKeyAndOrderFront:self];
+  }
+  return YES;
+}
+
 @end