Migrate hsd's setup.cfg to pyproject.toml

pyproject.toml

@@ -1,3 +1,28 @@
 [build-system]
-requires = ["setuptools", "wheel"]
-build-backend = "setuptools.build_meta"
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "hsd"
+version = "0.1"
+authors = [{name = "DFTB+ developers group"}, {email = "info@dftbplus.org"},]
+dependencies = ["numpy", "scipy"]
+requires-python = ">=3.2"
+description = "Tools for reading, writing and manipulating data stored in the human-friendly structured data (HSD) format"
+readme = {file = "README.rst", content-type = "text/x-rst"}
+license = {text = "BSD"}
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "Intended Audience :: Developers",
+  "License :: OSI Approved :: BSD License",
+  "Programming Language :: Python :: 3",
+  "Environment :: Console",
+  "Operating System :: OS Independent",
+  "Topic :: Scientific/Engineering",
+]
+
+[project.urls]
+Homepage = "http://www.dftbplus.org"
+Documentation = "https://hsd-python.readthedocs.io/en/latest/"
+Repository = "https://github.com/dftbplus/hsd-python.git"
+Issues = "https://github.com/dftbplus/hsd-python/issues"