add private module to create model object for acoustics api

opendbm/api_lib/verbal_acoustics/_jitter.py

@@ -0,0 +1,14 @@
+import pandas as pd
+
+from opendbm.api_lib.model import AudioModel
+from opendbm.dbm_lib.dbm_features.raw_features.audio.jitter import run_jitter
+
+
+class Jitter(AudioModel):
+    def __init__(self):
+        super().__init__()
+        self._params = ["aco_jitter"]
+
+    @AudioModel.prep_func
+    def _fit_transform(self, path, **kwargs):
+        return run_jitter(path, ".", self.r_config, save=False, ff_df=kwargs["ff_df"])