added model card

Model card for usage

README.md

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+# Masked Language Model for nepali language trained on nepali news scrapped from different nepali news website. The data set contained about 10 million of nepali sentences mainly related to nepali news.
+
+
+Usage
+```
+from transformers import AutoTokenizer, AutoModelForMaskedLM
+tokenizer = AutoTokenizer.from_pretrained("Shushant/nepaliBERT")
+model = AutoModelForMaskedLM.from_pretrained("Shushant/nepaliBERT")
+
+from transformers import pipeline
+
+fill_mask = pipeline( "fill-mask", model=model, tokenizer=tokenizer, ) from pprint import pprint pprint(fill_mask(f"तिमीलाई कस्तो {tokenizer.mask_token}."))
+```