Update README.md

README.md

@@ -1,3 +1,29 @@
 ---
+library_name: transformers
+tags:
+- transformers.js
+- tokenizers
 license: mit
 ---
+
+# Claude Tokenizer
+
+A 🤗-compatible version of the **Claude tokenizer** (adapted from [anthropics/anthropic-sdk-python](https://github.com/anthropics/anthropic-sdk-python)). This means it can be used with Hugging Face libraries including [Transformers](https://github.com/huggingface/transformers), [Tokenizers](https://github.com/huggingface/tokenizers), and [Transformers.js](https://github.com/xenova/transformers.js).
+
+## Example usage:
+
+### Transformers/Tokenizers
+```py
+from transformers import GPT2TokenizerFast
+
+tokenizer = GPT2TokenizerFast.from_pretrained('Xenova/claude-tokenizer')
+assert tokenizer.encode('hello world') == [9381, 2253]
+```
+
+### Transformers.js
+```js
+import { AutoTokenizer } from '@xenova/transformers';
+
+const tokenizer = await AutoTokenizer.from_pretrained('Xenova/claude-tokenizer');
+const tokens = tokenizer.encode('hello world'); // [9381, 2253]
+```