add readme

README.md

@@ -22,4 +22,26 @@ dataset_info:
     num_examples: 29081
   download_size: 63542382099
   dataset_size: 84012036587
+language:
+- en
+- es
+- ru
+- ar
+- fr
+- pt
+- hr
+- zh
+- de
+- ko
+tags:
+- web
+- multilingual
+- extraction
+- news
+size_categories:
+- 10K<n<100K
 ---
+
+# MHTML Sources for NewsXLM dataset
+
+`mhtml` — MHTML snapshots of pages where `wtl-uid` and `wtl-parent-uid` attributes have been added to every element in \<body\>, following the [WTL algorithm](https://github.com/klarna-incubator/webtraversallibrary/blob/master/webtraversallibrary/js/get_element_metadata.js).