Update README.md

README.md

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 license: cc-by-nc-sa-2.0
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+PISCES is a pre-trained many-to-many summarization model that learns language modeling, cross-lingual ability and summarization ability through a designed three-stage pre-training.
+
+This model is introduced by *Towards Unifying Multi-Lingual and Cross-Lingual Summarization* (To appear in ACL 2023 main conference)
+
+
+```python
+tokenizer = MBart50Tokenizer.from_pretrained('Krystalan/PISCES')
+model = MBartForConditionalGeneration.from_pretrained('Krystalan/PISCES')
+```