add preprocessing dir, add logging for module imports

src/input/__init__.py

@@ -0,0 +1,12 @@
+# __init__.py
+
+import logging
+from datetime import datetime
+
+# Configure logging
+logging.basicConfig(
+    format='%(asctime)s : %(message)s',
+    level = logging.INFO
+)
+
+logging.info("freq-split-enhance/input package has been imported.")

src/preprocessing/__init__.py

@@ -0,0 +1,12 @@
+# __init__.py
+
+import logging
+from datetime import datetime
+
+# Configure logging
+logging.basicConfig(
+    format='%(asctime)s : %(message)s',
+    level = logging.INFO
+)
+
+logging.info("freq-split-enhance/preprocessing package has been imported.")