feat(Models): added a basic sktime model and missing USD crypto currency pairs (#7)

utils/sktime.py

@@ -0,0 +1,17 @@
+import pandas as pd
+import numpy as np
+
+def from_df_to_sktime_data(x: pd.DataFrame) -> pd.DataFrame:
+    instance_list = []
+    instance_list.append([])
+    
+    x_data = pd.DataFrame(dtype=np.float32)
+    
+    for i in range(len(x.index)):
+        instance_list[0].append(pd.Series(x.iloc[i]))
+    
+    # only dim_0 for univariate time series
+    for dim in range(len(instance_list)):
+        x_data['dim_' + str(dim)] = instance_list[dim]
+    
+    return x_data