Create py.typed (#346)

* Create py.typed

As recommended in [pep 0561](https://peps.python.org/pep-0561/), a blank `py.typed` marker should be included when type hints are used so downstream codes can type check with `mypy` and similar tools.

* pre-commit auto-fixes

* Update pyproject.toml

* Update test.yml

* Update pyproject.toml

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/test.yml

@@ -46,7 +46,7 @@ jobs:
         run: conda install -c conda-forge openbabel
 
       - name: Install dependencies
-        run: uv pip install numpy==1.26.4 ; uv pip install -e '.[dev]' --system
+        run: uv pip install -e '.[dev]' --system
 
       - name: pytest
         env:

pyproject.toml

@@ -19,7 +19,7 @@ maintainers = [{ name = "Janosh Riebesell" }, { name = "Shyue Ping Ong" }]
 readme = "README.md"
 keywords = ["jit", "job", "just-in-time", "management", "vasp", "nwchem", "qchem"]
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
@@ -163,3 +163,6 @@ reportMissingImports = false
 reportMissingModuleSource = false
 reportInvalidTypeForm = false
 exclude = ["**/tests"]
+
+[tool.setuptools.package-data]
+custodian = ["py.typed"]