Add tokenizer_config.json for AutoTokenizer compatibility

tokenizer_config.json

@@ -0,0 +1,16 @@
+{
+  "auto_map": {
+    "AutoTokenizer": [
+      "tokenization_plasmid_lm.PlasmidLMTokenizer",
+      null
+    ]
+  },
+  "tokenizer_class": "PlasmidLMTokenizer",
+  "bos_token": "<BOS>",
+  "eos_token": "<EOS>",
+  "unk_token": "<UNK>",
+  "pad_token": "<PAD>",
+  "sep_token": "<SEP>",
+  "model_max_length": 16384,
+  "use_fast": false
+}