Standardize license to CC BY-NC 4.0 and add research-use notice

README.md

@@ -1,7 +1,7 @@
 ---
 language:
 - tw
-license: cc-by-4.0
+license: cc-by-nc-4.0
 task_categories:
 - text-generation
 - fill-mask
@@ -14,6 +14,8 @@ tags:
 - africa
 ---
 
+> This dataset is shared under CC BY-NC 4.0, which means you are free to use, share, and adapt it for non-commercial research and educational purposes with attribution. You can read the full license at https://creativecommons.org/licenses/by-nc/4.0/.
+
 # Pristine Twi Dataset
 
 A large-scale Twi language dataset containing clean and naturally sounding Twi text across
@@ -28,7 +30,7 @@ and other NLP tools for the Akan language family.
 | Field        | Detail                        |
 |------------- |-------------------------------|
 | Language     | Twi (tw) — Akan, Ghana        |
-| License      | CC BY 4.0                     |
+| License      | CC BY-NC 4.0                     |
 | Author       | Mich-Seth Owusu               |
 | Organization | Ghana NLP Community           |
 | Format       | Parquet (columnar)            |