Configure gitignore to track only src directory

gru_sac_predictor/.gitignore

@@ -0,0 +1,26 @@
+    # Python cache
+    __pycache__/
+    *.py[cod]
+    *$py.class
+
+    # Virtual environment
+    .venv/
+    venv/
+    ENV/
+
+    # Data / Models / Results (if large or generated)
+    data/
+    models/
+    results/
+    logs/
+
+    # IDE / Editor specific
+    .vscode/
+    .idea/
+    *.swp
+
+    # OS specific
+    .DS_Store
+    Thumbs.db
+
+    cuda*