Reddit dataset card contribution (#3797)

* Proposed changes are based on the official paper of the dataset. The name given to the dataset by the authors is Webis-TLDR-17 (corpus), so perhaps it should be modified as well.

* README.md.bak removed

* mention Webis-TLDR-17 in the title

* Add tags at the beginning of README.md

* Update datasets/reddit/README.md

Co-authored-by: anna-kay <annakougioumtz@gmail.com>
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>

Commit from https://github.com/huggingface/datasets/commit/4380cb2a1cb0f08b9144b31195cd3a20c2511302

README.md

@@ -1,8 +1,24 @@
 ---
+annotations_creators:
+- no-annotation
+language_creators:
+- crowdsourced
 languages:
 - en
-paperswithcode_id: reddit
+licenses:
+- cc-by-4-0
+multilinguality:
+- monolingual
+paperswithcode_id: null
 pretty_name: Reddit Webis-TLDR-17
+size_categories:
+- 1M<n<10M
+source_datasets:
+- original
+task_categories:
+- conditional-text-generation
+task_ids:
+- summarization
 ---
 
 # Dataset Card for Reddit Webis-TLDR-17