Add license information

README.md

@@ -66,4 +66,8 @@ While having full executable code theoretically allows us to generate reliable e
 
 This dataset is synthesized from:
 - Python educational content sourced under **CC-BY-SA 4.0** license
-- Model-generated reasoning traces using a model trained under **Apache 2.0** license
+- Model-generated reasoning traces using a model trained under **Apache 2.0** license
+
+**License**
+
+The license for this dataset is Apache 2.0.