Add domains transfer API

#660

app/api/repp/domain_transfers_v1.rb

@@ -0,0 +1,18 @@
+module Repp
+  class DomainTransfersV1 < Grape::API
+    version 'v1', using: :path
+
+    resource :domain_transfers do
+      post '/' do
+        params['domainTransfers'].each do |domain_transfer|
+          domain_name = domain_transfer['domainName']
+          auth_info = domain_transfer['authInfo']
+          new_registrar = current_user.registrar
+
+          domain = Domain.find_by(name: domain_name)
+          domain.transfer(registrar: new_registrar, auth_info: auth_info)
+        end
+      end
+    end
+  end
+end