Add ability to sync items w icloud && update README

Author: philipshen

README.md

@@ -201,6 +201,13 @@ SInfo.setItem('key1', 'value1', {
 
 Note: By default `kSecAccessControl` will get set to `kSecAccessControlUserPresence`.
 
+#### kSecAttrSynchronizable
+
+You can set this to `true` in order to sync the keychain items with iCloud.
+
+Note: By default `kSecAttrSynchronizable` will get set to `false`.
+
+
 # How to use?
 
 Here is a simple example:

ios/RNSensitiveInfo/RNSensitiveInfo.m

@@ -124,6 +124,10 @@ - (NSString *)messageForError:(NSError *)error
                                       valueData, kSecValueData,
                                       key, kSecAttrAccount, nil];
 
+    if([RCTConvert BOOL:options[@"kSecAttrSynchronizable"]]){
+        [query setValue:@YES forKey:(NSString *)kSecAttrSynchronizable];
+    }
+
     if([RCTConvert BOOL:options[@"touchID"]]){
         CFStringRef kSecAccessControlValue = convertkSecAccessControl([RCTConvert NSString:options[@"kSecAccessControl"]]);
         SecAccessControlRef sac = SecAccessControlCreateWithFlags(kCFAllocatorDefault, kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly, kSecAccessControlValue, NULL);
@@ -155,6 +159,7 @@ - (NSString *)messageForError:(NSError *)error
     NSMutableDictionary* query = [NSMutableDictionary dictionaryWithObjectsAndKeys:(__bridge id)(kSecClassGenericPassword), kSecClass,
                                   keychainService, kSecAttrService,
                                   key, kSecAttrAccount,
+                                  kSecAttrSynchronizableAny, kSecAttrSynchronizable
                                   kCFBooleanTrue, kSecReturnAttributes,
                                   kCFBooleanTrue, kSecReturnData,
                                   nil];
@@ -224,6 +229,7 @@ - (void)getItemWithQuery:(NSDictionary *)query resolver:(RCTPromiseResolveBlock)
 
     NSMutableArray* finalResult = [[NSMutableArray alloc] init];
     NSMutableDictionary *query = [NSMutableDictionary dictionaryWithObjectsAndKeys:
+                                  (__bridge id)kSecAttrSynchronizableAny, kSecAttrSynchronizable,
                                   (__bridge id)kCFBooleanTrue, (__bridge id)kSecReturnAttributes,
                                   (__bridge id)kSecMatchLimitAll, (__bridge id)kSecMatchLimit,
                                   (__bridge id)kCFBooleanTrue, (__bridge id)kSecReturnData,
@@ -285,6 +291,7 @@ - (void)getItemWithQuery:(NSDictionary *)query resolver:(RCTPromiseResolveBlock)
     // Create dictionary of search parameters
     NSDictionary* query = [NSDictionary dictionaryWithObjectsAndKeys:
                           (__bridge id)(kSecClassGenericPassword), kSecClass,
+                          (__bridge id)(kSecAttrSynchronizableAny), kSecAttrSynchronizable,
                           keychainService, kSecAttrService,
                           key, kSecAttrAccount,
                           kCFBooleanTrue, kSecReturnAttributes,