add tokenizer information to README.md

README.md

@@ -10,10 +10,12 @@ datasets:
 A BERT model for [nagisa](https://github.com/taishi-i/nagisa).
 The model is available in [Transformers](https://github.com/huggingface/transformers) 🤗.
 
+A tokenizer for nagisa_bert is available [here](https://github.com/taishi-i/nagisa_bert).
+
 ## Install
 
 To use this model, the following python library must be installed.
-You can install *nagisa_bert* by using the *pip* command.
+You can install [*nagisa_bert*](https://github.com/taishi-i/nagisa_bert) by using the *pip* command.
 
 Python 3.7+ on Linux or macOS is required.