[MAIN] init git repo , implement fitter class, organize workdir of repo

.gitignore

@@ -13,3 +13,20 @@
 # .nfs files are created when an open file is removed but is still being accessed
 .nfs*
 
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+dist/
+build/
+
+# uv
+.venv/
+
+# Jupyter
+.ipynb_checkpoints/
+
+# Data (large files)
+data/*
+!data/.gitkeep
+