Update the cream utility

.github/workflows/cream-test.yml

@@ -0,0 +1,34 @@
+name: cream-test
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11"]
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{matrix.python-version}}
+    - name: install and test
+      working-directory: ./cream
+      run: |
+        python -m pip install .[test]
+        pytest
+  check-formating:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: psf/black@stable
+      with:
+        src: "./cream/"
+

cream/cream/__init__.py

@@ -0,0 +1,14 @@
+"""Utility library for the SCONE Monte Carlo Code[project.optional-dependencies]
+
+Dummy doctest
+>>> 2 + 1
+3
+"""
+
+import click
+
+
+@click.command()
+def main():
+    """Command line utility for SCONE Monte Carlo Code."""
+    pass