Update 02-top-level-menu-features.md

Added instructor notes outlining Mac limitations

episodes/02-top-level-menu-features.md

@@ -21,6 +21,17 @@ exercises: 3
 
 ## Getting Started with MarcEdit
 
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+Note: A number of differences have been noted in the Top Level Menu design and features for Mac users in this lesson:
+- Help is in the top menu bar, not in the window
+- Preferences gearbox is located on the bottom right hand corner of the main window
+- Add a shortcut is not available on a Mac
+- Quicklinks are not available on a Mac
+- File association settings are not available on a Mac
+
+:::::::::::::::::::::::::::::::::::::::::::::::::
+
 ## Top Level Menu Features
 
 When you launch MarcEdit, the main window opens. From here, you can access the suite of MarcEdit tools, features, plug-ins, quick links, or help.