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

.pre-commit-config.yaml

@@ -0,0 +1,24 @@
+repos:
+  # Ruff via uv
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.6.9  # pick the latest release
+    hooks:
+      - id: ruff
+        args: [--fix]        # optional: auto-fix issues
+      - id: ruff-format      # black-compatible formatter
+
+  # Mypy via uv
+  - repo: local
+    hooks:
+      - id: mypy
+        name: mypy (via uv)
+        entry: uv run mypy
+        language: system
+        types: [python]
+        pass_filenames: false
+        args:
+          - --allow-redefinition
+          - --disable-error-code=import-untyped
+          - --ignore-missing-imports
+          - .
+