[pyproject] Add mypy support

pyproject.toml

@@ -42,4 +42,28 @@ build-backend = "setuptools.build_meta"
 version = { attr = "font_collector._version.__version__" }
 
 [tool.setuptools.packages.find]
-include = ["font_collector*"]
+include = ["font_collector*"]
+
+[tool.mypy]
+warn_unused_configs = true
+strict = true
+
+[[tool.mypy.overrides]]
+module = "ass.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "ass_tag_analyzer.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "find_system_fonts_filename.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "fontTools.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "freetype.*"
+ignore_missing_imports = true