Update readme

README.md

@@ -70,3 +70,10 @@ labels_predicted = logits.argmax(-1)
 lang_tag_predicted = [model_best.config.id2label[t.item()] for t in labels_predicted[0]]
 lang_tag_predicted
 ```
+
+## Limitations
+The model might show some contradictory or conflicting behavior sometimes. Some of the known (till now) issues are:
+* The model might not be able to predict a small number (typically 1 or 2) of tokens from another language if they are found in the sequence of one language.
+* The model might consider the language of the tokens in a noun phrase the same as the other tokens, even if the language of the tokens (noun phrase) is different.
+* Proper nouns, and some cross-lingual tokens (in, me, etc.) might be wrongly predicted.
+* The prediction also depends on punctuation.