Add rot_3D and tests for rot_2D/rot_3D

pyproject.toml

@@ -2,4 +2,13 @@
 name = "matrixmania"
 version = "0.1.0"
 
-dependencies = ["tabulate", "ruff"]
+dependencies = ["tabulate", "ruff"]
+
+[project.optional-dependencies]
+dev = ["pytest", "ruff", "pytest-cov"]
+
+[tool.pytest.ini_options]
+pythonpath = "src"
+testpaths = "test"
+
+