Add task_categories tag

README.md

@@ -1,6 +1,8 @@
 ---
 language:
 - en
+task_categories:
+- text-classification
 ---
 
 ** Attention: There appears an overlap in train / test. I trained a model on the train set and achieved 100% acc on test set. With the original emotion dataset this is not the case (92.4% acc)**