create a minimal cli interface for template

developing.md

@@ -142,6 +142,28 @@ Please also update the project URL to your project:
 "Homepage" = "https://github.com/RasmussenLab/python_package"
 ```
 
+The template also sets a command line script entry point, which allows to run
+the function `main` in the `mockup` module of the package as a command line script,
+wrapping the `hello_world` function from the `mockup` module.
+The template uses the standard library [argparse](https://docs.python.org/3/library/argparse.html)
+module to parse parameters from the command line and creates a basic interface.
+
+```toml
+# Script entry points, i.e. command line commands available after installing the package
+# e.g. implemented using argparse
+# Then you can type: `python-package-hello -h` in the terminal
+[project.scripts]
+python-package-hello = "python_package.cli:main"
+```
+
+You can therefore run the command line script using:
+
+```bash
+python-package-hello -h
+# print hello world 3 times
+python-package-hello -n 3
+```
+
 ## Source directory layout of the package
 
 The source code of the package is located in the `src` directory, to have a project 

pyproject.toml

@@ -68,3 +68,9 @@ requires = ["setuptools>=64", "setuptools_scm>=8"]
 
 [tool.isort]
 profile = "black"
+
+# Script entry points, i.e. command line commands available after installing the package
+# e.g. implemented using argparse
+# Then you can type: `python-package-hello -h` in the terminal
+[project.scripts]
+python-package-hello = "python_package.cli:main"

src/python_package/cli.py

@@ -0,0 +1,17 @@
+import argparse
+
+from .mockup import hello_world
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Python Package CLI")
+    parser.add_argument(
+        "-n",
+        "--repeat",
+        type=int,
+        default=1,
+        help="Number of times to repeat the greeting hello world",
+    )
+    args = parser.parse_args()
+    msg = hello_world(args.repeat)
+    print(msg)