feat: set up modularized version of project with testing

pyproject.toml

@@ -0,0 +1,32 @@
+[project]
+name = "timesheets"
+version = "0.1.0"
+description = "Parse markdown timesheet tables and export to CSV"
+readme = "README.md"
+authors = [
+    { name = "Jef Roosens", email = "roosenj@factry.io" }
+]
+requires-python = ">=3.13"
+dependencies = []
+
+[project.scripts]
+timesheets = "timesheets.cli:main"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[tool.coverage.run]
+source = ["timesheets"]
+
+[tool.coverage.report]
+show_missing = true
+
+[build-system]
+requires = ["uv_build>=0.10.8,<0.11.0"]
+build-backend = "uv_build"
+
+[dependency-groups]
+dev = [
+    "pytest>=9.0.3",
+    "pytest-cov>=7.1.0",
+]