Objective-C example code in README.md

[cool8jay]

Tested on my Mac. Please add.

#import <ShortcutRecorder/ShortcutRecorder.h>

NSUserDefaultsController *defaults = [NSUserDefaultsController sharedUserDefaultsController];
NSString *keyPath = @"values.shortcut";
NSDictionary *options = @{NSValueTransformerNameBindingOption:NSKeyedUnarchiveFromDataTransformerName};
    
SRShortcutAction *beepAction = [SRShortcutAction shortcutActionWithKeyPath:keyPath
                                                                      ofObject:defaults
                                                                 actionHandler:^BOOL(SRShortcutAction *anAction) {
    NSBeep();
    return YES;
}];
    
[[SRGlobalShortcutMonitor sharedMonitor] addAction:beepAction forKeyEvent:SRKeyEventTypeDown];
    
SRRecorderControl *recorder = [[SRRecorderControl alloc] init];
[recorder bind:NSValueBinding toObject:defaults withKeyPath:keyPath options:options];
recorder.objectValue = [SRShortcut shortcutWithKeyEquivalent:@"⇧⌘A"];

[Kentzo]

Thank you! I have slightly changed the syntax for symmetry.