feat: return identifier with contacts (#11)

Co-authored-by: Kishan Bagaria <KishanBagaria@users.noreply.github.com>

Author: KishanBagaria

README.md

@@ -56,6 +56,7 @@ Returns `Array<Object>` - Returns an array of contact objects.
 
 The returned objects will take the following format:
 
+* `identifier` String - The contact's unique identifier.
 * `firstName` String - The contact's first name, or an empty string ('') if one is not set.
 * `lastName` String - The contact's last name, or an empty string ('') if one is not set.
 * `nickname` String - The contact's nickname, or an empty string ('') if one is not set.
@@ -107,6 +108,7 @@ If a contact's full name is 'Shelley Vohr', I could pass 'Shelley', 'Vohr', or '
 
 The returned object will take the following format:
 
+* `identifier` String - The contact's unique identifier.
 * `firstName` String - The contact's first name, or an empty string ('') if one is not set.
 * `lastName` String - The contact's last name, or an empty string ('') if one is not set.
 * `nickname` String - The contact's nickname, or an empty string ('') if one is not set.

contacts.mm

@@ -143,6 +143,8 @@
 
   // Default contact properties.
 
+  contact.Set("identifier", std::string([[cncontact identifier] UTF8String]));
+
   contact.Set("firstName", std::string([[cncontact givenName] UTF8String]));
   contact.Set("lastName", std::string([[cncontact familyName] UTF8String]));
   contact.Set("nickname", std::string([[cncontact nickname] UTF8String]));