get transformation information (mean, std, method) from data prep class

src/data_handling/data_preparation.py

@@ -249,6 +249,17 @@ class DataPrep(object):
         else:
             self.inverse_transform()
 
+    def get_transformation_information(self, variable):
+        try:
+            mean = self.mean.sel({'variables': variable}).values
+        except AttributeError:
+            mean = None
+        try:
+            std = self.std.sel({'variables': variable}).values
+        except AttributeError:
+            std = None
+        return mean, std, self._transform_method
+
     def make_history_window(self, dim: str, window: int) -> None:
         """
         This function uses shifts the data window+1 times and returns a xarray which has a new dimension 'window'