chore(readme): update readme

Author: ChieloNewctle

README.md

@@ -192,6 +192,30 @@ cnt_info = automaton.prepend_feed(state, '来')
 assert state.is_nil()
 ```
 
+### `GreedyTokenizer`
+
+```python
+vocab = ['歌曲', '聆听歌曲', '播放歌曲', '歌词', '查看歌词', '听歌', '曲折']
+trie, token_to_trie_node = build_trie_from_chars(vocab)
+
+trie_node_to_token = [-1] * trie.num_of_nodes()
+for i, j in enumerate(token_to_trie_node):
+    trie_node_to_token[j] = i
+
+sam = GeneralSAM.from_trie(trie)
+tokenizer = GreedyTokenizer.from_sam_and_trie(sam, trie)
+
+def tokenize(s: str):
+    return [(trie_node_to_token[i], j) for i, j in tokenizer.tokenize_str(s)]
+
+assert tokenize('歌曲折') == [(0, 2), (-1, 1)]
+assert tokenize('听歌曲') == [(5, 2), (-1, 1)]
+assert tokenize('听歌曲折') == [(5, 2), (6, 2)]
+assert tokenize('聆听歌曲折') == [(1, 4), (-1, 1)]
+assert tokenize('查看歌词歌曲') == [(4, 4), (0, 2)]
+assert tokenize('一起播放歌曲并共享歌词') == [(-1, 2), (2, 4), (-1, 3), (3, 2)]
+```
+
 ## License
 
 - &copy; 2023 Chielo Newctle \<[ChieloNewctle@gmail.com](mailto:ChieloNewctle@gmail.com)\>