* adding __init__.py

Author: miranov25

UTILS/dfextensions/__init__.py

@@ -0,0 +1,12 @@
+# __init__.py
+
+from .AliasDataFrame import AliasDataFrame
+from .FormulaLinearModel import FormulaLinearModel
+from .DataFrameUtils import *  # if it provides general helper functions
+from .groupby_regression import *  # or other relevant functions
+
+__all__ = [
+    "AliasDataFrame",
+    "FormulaLinearModel",
+    "GroupByRegressor"
+]