Add copyright info for wiki_lingua dataset

Author: PhilipMay

datasets/wiki_lingua/README.md

@@ -244,12 +244,14 @@ ______________________________
 
 ### Licensing Information
 
-[More Information Needed]
+- Article provided by wikiHow https://www.wikihow.com/Main-Page, a wiki building the world's largest, highest quality how-to manual. Please edit this article and find author credits at wikiHow.com. Content on wikiHow can be shared under a [Creative Commons license](http://creativecommons.org/licenses/by-nc-sa/3.0/).
+- Refer to [this webpage](https://www.wikihow.com/wikiHow:Attribution) for the specific attribution guidelines.
+- also see https://gem-benchmark.com/data_cards/WikiLingua
 
 ### Citation Information
 
 [More Information Needed]
 
 ### Contributions
 
-Thanks to [@katnoria](https://github.com/katnoria) for adding this dataset.
+Thanks to [@katnoria](https://github.com/katnoria) for adding this dataset.