added data dir and .gitkeep files

.gitignore

@@ -1,2 +1,17 @@
 .idea/
 +**/__pycache__/
+
+# Ignore data files but keep directory structure
+data/**/*.mat
+data/**/*.npy
+data/**/*.pkl
+data/**/*.h5
+data/**/*.hdf5
+data/**/*.csv
+data/**/*.json
+data/**/*.txt
+data/**/*.bin
+data/**/*.dat
+
+# But don't ignore .gitkeep files
+!data/**/.gitkeep

scripts/add_gitkeep.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+"""
+Script to add .gitkeep files to all subdirectories in the data folder.
+This ensures that empty directories are tracked by git even when the data folder is in .gitignore.
+"""
+
+import os
+from pathlib import Path
+
+def add_gitkeep_to_directories(root_path: str | Path):
+    """
+    Recursively add .gitkeep files to all subdirectories.
+    
+    Args:
+        root_path: Path to the root directory to process
+    """
+    root = Path(root_path)
+    
+    if not root.exists():
+        print(f"Error: {root_path} does not exist")
+        return
+    
+    if not root.is_dir():
+        print(f"Error: {root_path} is not a directory")
+        return
+    
+    gitkeep_count = 0
+    
+    # Walk through all subdirectories
+    for dirpath, dirnames, filenames in os.walk(root):
+        dir_path = Path(dirpath)
+        
+        # Skip if .gitkeep already exists
+        gitkeep_file = dir_path / ".gitkeep"
+        if gitkeep_file.exists():
+            print(f"  Skipping {dir_path} (already has .gitkeep)")
+            continue
+        
+        # Add .gitkeep file
+        gitkeep_file.touch()
+        print(f"  Added .gitkeep to {dir_path}")
+        gitkeep_count += 1
+    
+    print(f"\nTotal .gitkeep files added: {gitkeep_count}")
+
+if __name__ == "__main__":
+    # Add .gitkeep to all subdirectories in the data folder
+    data_path = Path("data")
+    
+    print(f"Adding .gitkeep files to subdirectories in {data_path.absolute()}")
+    print("=" * 60)
+    
+    add_gitkeep_to_directories(data_path)
+    
+    print("\nDone!")