diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6e4b37f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+# Ignore feature_* directory (usually used as git worktree)
+feature_*/
+
+# Ignore extensions directory
+extensions/*
+!extensions/__init__.py
+
+# Ignore some symbolic links
+install
+
+# Ignore specific directories and files
+.ipynb_checkpoints/
+*/.ipynb_checkpoints/
+.vscode/
+*.pyc
+__pycache__/
+pysbmy.egg-info/
+*.h5
+*.rng
+*.gadget1
+*.gadget2
+*.gadget3
+log.txt
+testpdf.txt
+tests/