Update README.md

README.md

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 license: ecl-2.0
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+## Filename explanations:
+
+model_xl: the model trained on the cross-language dataset
+
+model_en: the model trained on the RAVDESS dataset
+
+model_cn: the model trained on the Chinese Mandarin speech data in the ESD dataset
+
+model_de: the model trained on the EMO-DB dataset
+
+model_fr: the model trained on the CaFE_48k dataset
+
+model_pt: the model trained on the VERBO dataset
+
+## Notes:
+
+The models are trained using the Learning API `xgb.train()`. 
+
+The hyperparameters of the models are not saved with the JSON files; `get_params()` method will not work on these model files. 
+
+The hyperparameters can be found in the `params.txt`.