feat: add addition function and its test-function

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.2
+    hooks:
+      - id: ruff # Linting
+
+  - repo: https://github.com/psf/black
+    rev: 26.1.0
+    hooks:
+      - id: black # formatting

pyproject.toml

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+[tool.pytest.ini_options]
+pythonpath = ["."]

src/moduleA.py

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+def addition(a=1, b=2):
+    return a + b
+
+
+def f(x: int, y: int) -> int:
+    return x + y
+
+
+if __name__ == "__main__":
+    print(addition(5, 5))

tests/test_moduleA.py

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+from src.moduleA import addition
+
+
+def test_a():
+    assert addition() == 3
+    assert addition(5, 5) == 10