Ignore PDM project-wide config

See https://pdm.fming.dev/#use-with-ide

Python.gitignore

@@ -101,7 +101,13 @@ ipython_config.py
 #   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
 #poetry.lock
 
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+# pdm
+#   pdm stores project-wide configurations in .pdm.toml, and it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
 __pypackages__/
 
 # Celery stuff