[meta] describe project in pyproject.toml

Dependencies are still in requirements/*

pyproject.toml

@@ -0,0 +1,15 @@
+[project]
+name = "PACKAGENAME"
+dynamic = ["version"]
+
+# Dependencies are kept in requirements/*.in and compiled using
+# pip-compile-multi. Maybe at some point pip-compile-multi will support reading
+# requirements from pyproject.toml. At this point in time, the issue is still
+# open: https://github.com/peterdemin/pip-compile-multi/issues/283
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.pytest.ini_options]
+pythonpath = ["src"]