Update README.md

README.md

@@ -51,6 +51,12 @@ for sample in ds["train"]:
 ds = load_dataset('imvladikon/nemo_corpus', "nested")
 ```
 
+Getting classes and encoding/decoding could be done like through 
+```
+idx2label = dataset["train"].features["ner_tags"].feature.int2str
+label2idx = dataset["train"].features["ner_tags"].feature.str2int
+```
+
 
 ## Dataset Description 
 it's README.md of the [original repository](https://github.com/OnlpLab/NEMO-Corpus)