readme: mention disabling of inference widget

Hi,
This PR currently disabled the inference widget and adds further explanation about the reasons

README.md

@@ -6,6 +6,7 @@ tags:
 - token-classification
 - sequence-tagger-model
 base_model: hmteams/teams-base-historic-multilingual-discriminator
+inference: false
 widget:
 - text: — 469 . Πεδία . Les tribraques formés par un seul mot sont rares chez les
     tragiques , partont ailleurs qu ’ au premier pied . CÉ . cependant QEd , Roi ,
@@ -24,6 +25,18 @@ project.
 
 The following NEs were annotated: `pers`, `work`, `loc`, `object`, `date` and `scope`.
 
+# ⚠️ Inference Widget ⚠️
+
+Fine-Tuning ByT5 models in Flair is currently done by implementing an own [`ByT5Embedding`][1] class.
+
+This class needs to be present when running the model with Flair.
+
+Thus, the inference widget is not working with hmByT5 at the moment on the Model Hub and is currently disabled.
+
+This should be fixed in future, when ByT5 fine-tuning is supported in Flair directly.
+
+[1]: https://github.com/stefan-it/hmBench/blob/main/byt5_embeddings.py
+    
 # Results
 
 We performed a hyper-parameter search over the following parameters with 5 different seeds per configuration: