update readme for azure-identity to include BOM information (#22856)
update readme for azure-identity to include BOM information (#22856)

* update readme for azure-identity to include BOM information

* Update the readme to have BOM information
Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java