Start coding of solutions

- Implement OLS and Ridge as well as python structure
- Start with gradient descent
- Create plots for the above mentioned
- Create a basic structure for the python source
- Install pre commit hooks to check and format the code

pyproject.toml

@@ -7,8 +7,12 @@ requires-python = ">=3.13"
 dependencies = [
     "ipykernel>=6.30.1",
     "matplotlib>=3.10.6",
+    "mypy>=1.17.1",
     "numpy>=2.3.2",
     "pandas>=2.3.2",
     "scikit-learn>=1.7.1",
     "scipy>=1.16.1",
 ]
+
+[tool.mypy]
+mypy_path = "src"