Added rubocop style configuration to ignore XML template files.
Added rubocop style configuration to ignore XML template files.

AzureAD/azure-activedirectory-library-for-ruby,AzureAD/azure-activedirectory-library-for-ruby,cosmincojocar/azure-activedirectory-library-for-ruby,cosmincojocar/azure-activedirectory-library-for-ruby