add mypy

pyproject.toml

@@ -9,8 +9,8 @@ dynamic = ["version"]
 dependencies = [
     "gitpython>=3.1.45",
     'pyerrors>=2.11.1',
-    'datalad>=1.1.0',
-    'typer>=0.12.5'
+    "datalad>=1.1.0",
+    'typer>=0.12.5',
 ]
 description = "Python correlation library"
 authors = [
@@ -35,9 +35,16 @@ extend-select = [
   "F",
 ]
 
+[tool.mypy]
+strict = true
+implicit_reexport = false
+follow_untyped_imports = false
+ignore_missing_imports = true
+
 [dependency-groups]
 dev = [
     "mypy>=1.19.0",
+    "pandas-stubs>=2.3.3.251201",
     "pytest>=9.0.1",
     "pytest-cov>=7.0.0",
     "pytest-pretty>=1.3.0",