Add pyproject.toml metadata

Fixes: #7

pyproject.toml

@@ -5,6 +5,24 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "crypt_r"
 version = "3.12.3"
+maintainers = [
+    {name = "Miro Hrončok", email = "[email protected]"},
+    {name = "Petr Viktorin", email = "[email protected]"},
+    {name = "Tomáš Hrnčiar", email = "[email protected]"},
+    {name = "Karolina Surma", email = "[email protected]"},
+]
+description = "A copy of the `crypt` module that was removed in Python 3.13"
+readme = "README.rst"
+# requires-python = ">=?.??" TODO
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: Python Software Foundation License",
+    "Operating System :: OS Independent",
+]
+
+[project.urls]
+"Homepage" = "https://github.com/fedora-python/crypt_r"
+"Bug Tracker" = "https://github.com/fedora-python/crypt_r/issues"
 
 [tool.setuptools]
 py-modules = ["crypt_r", "crypt"]