Update README.md

## Dataset audio info:
- 16000 Hz 16 bit
- wav
- mono
## Citation


@Misc
{Voxforge.org,
author = {Voxforge.org},
title = {Free Speech... Recognition (Linux, Windows and Mac) - voxforge.org},
howpublished = {\url{[http://www.voxforge.org/]}},
note = {accessed 01/21/2023},
}
## Source
http://www.voxforge.org/ru/downloads

README.md

@@ -16,6 +16,7 @@ dataset_info:
     num_examples: 2645
   download_size: 2705520657
   dataset_size: 2811888292.906
+license: apache-2.0
 ---
 # Dataset Card for "voxforge-ru-dataset"