Make a document-based application

Add the basic necessities for a document-based application. This is what
I came up with on 2023-09-10. The `DocumentWindowController` was just an
initial idea and doesn't do anything: we create the required window
controller in `Document`.

The `CFBundleDocumentTypes` entry enables us to interact with text
files.

This confirms that the "Open Recent" menu does get added automatically
below the "Open" menu.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/Document.h b/src/Document.h
new file mode 100644
index 0000000..e566ac0
--- /dev/null
+++ b/src/Document.h
@@ -0,0 +1,4 @@
+#import <Cocoa/Cocoa.h>
+
+@interface Document : NSDocument
+@end