Add pyproject.toml (#90)

pyproject.toml

@@ -0,0 +1,39 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "abjad-ext-nauert"
+version = "3.21"
+description = "Nauert extends Abjad with tools for rhythm quantization."
+license = { text = "MIT" }
+readme = "README.md"
+requires-python = ">=3.12"
+keywords = ["lilypond", "music composition", "music notation"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "License :: OSI Approved :: GNU General Public License (GPL)",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Artistic Software"
+]
+dependencies = [
+    "abjad>=3.21"
+]
+
+[[project.authors]]
+name = "Joséphine Wolf Oberholtzer"
+email = "[email protected]"
+
+[[project.authors]]
+name = "Tsz Kiu Pang"
+
+[project.urls]
+Homepage = "http://abjad.github.io"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["abjadext"]
+
+[tool.setuptools.package-data]
+"abjadext" = ["**/*"]