Allow creating models with identifier set

lib/liudesk_cmdb/model.rb

@@ -7,10 +7,11 @@ module LiudeskCMDB
   class Model
     attr_accessor :client
 
-    def initialize(client, **fields)
+    def initialize(client, identifier = nil, **fields)
       @client = client
 
       @data = {}
+      self.identifier = identifier if identifier
       self.class.fields.each do |field, _|
         @data[field] = fields[field] if fields.key? field
       end