Add README and publish repository metadata (MIL-003)

Write the README from the course template: requirements, setup with a
local .venv for Windows PowerShell, Debian and macOS, run, tests,
continuous integration, Doxygen build, project layout and license.

Verified from a fresh clone: setup, pytest, ruff, mypy, both run
commands and the Doxygen build. The repository description and topics
were set on git.tirsystem.com through its API.

Task: MIL-003#1
Task: MIL-003#2
Task: MIL-003#3
Task: MIL-003#4
Closes #12
Closes #13
Closes #14
Closes #15

README.md

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-# 016-oop_coffee_machine
+# OOP Coffee Machine
 
+An object-oriented coffee machine in Python, solved as an assignment of Udemy's
+*100 Days of Code: The Complete Python Pro Bootcamp*. The program takes a drink
+order, checks that the ingredients are sufficient, takes coins, gives change and
+makes the drink. It has no runtime dependencies, so it is easy to read, run and
+compare with your own solution.
+
+The classes and methods use the assignment's names:
+
+| Class | Methods |
+| --- | --- |
+| `Menu` | `get_items`, `find_drink` |
+| `CoffeeMaker` | `report`, `is_resource_sufficient`, `make_coffee` |
+| `MoneyMachine` | `report`, `process_coins`, `make_payment` |
+
+At the prompt you can type a drink name (`espresso`, `latte` or `cappuccino`),
+`report` to print the resources and the money in the machine, or `off` to stop.
+
+## Requirements
+
+- Python 3.13 or newer.
+- `venv` and `pip`, which come with Python (on Debian they are separate packages).
+- Git, to clone the repository.
+- Optional: [Doxygen](https://www.doxygen.nl/) to build the source documentation.
+
+There are no runtime dependencies. `pytest`, `ruff` and `mypy` are installed
+only for development, through the `dev` extra.
+
+## Set up
+
+Clone the repository and change into it:
+
+```bash
+git clone https://git.tirsystem.com/Tirsvad-Udemy-100_days_of_code/016-oop_coffee_machine.git
+cd 016-oop_coffee_machine
+```
+
+Then create a local virtual environment named `.venv`, upgrade `pip` and install
+the project in it.
+
+### Windows powershell
+
+```powershell
+python -m venv .venv
+.\.venv\Scripts\Activate.ps1
+python -m pip install --upgrade pip
+python -m pip install -e ".[dev]"
+```
+
+If PowerShell refuses to run the activation script, allow it for this window only
+with `Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass`.
+
+### Linux debian
+
+```bash
+sudo apt install python3 python3-venv python3-pip git
+python3 -m venv .venv
+source .venv/bin/activate
+python -m pip install --upgrade pip
+python -m pip install -e ".[dev]"
+```
+
+Debian 13 (trixie) ships Python 3.13. On an older release, install Python 3.13
+first (for example with `pyenv`) and use it to create the `.venv`.
+
+### MacOS
+
+```bash
+brew install python@3.13 git
+python3.13 -m venv .venv
+source .venv/bin/activate
+python -m pip install --upgrade pip
+python -m pip install -e ".[dev]"
+```
+
+To leave the virtual environment, run `deactivate`.
+
+## Run
+
+With the virtual environment active:
+
+```bash
+python -m coffee_machine
+```
+
+The installed command does the same:
+
+```bash
+coffee-machine
+```
+
+Example session:
+
+```text
+What would you like? (espresso/latte/cappuccino): latte
+Please insert coins.
+How many quarters?: 12
+How many dimes?: 0
+How many nickels?: 0
+How many pennies?: 0
+Here is $0.50 in change.
+Here is your latte. Enjoy!
+What would you like? (espresso/latte/cappuccino): off
+```
+
+## Run the tests
+
+With the virtual environment active:
+
+```bash
+python -m pytest
+```
+
+The linter and the strict type check that the project also uses:
+
+```bash
+ruff check .
+mypy
+```
+
+## Continuous integration
+
+The workflow in `.github/workflows/ci.yml` runs on every push and pull request. It
+runs on GitHub Actions and on Gitea Actions. It creates a virtual environment on
+Python 3.13, upgrades `pip`, installs the project with the `dev` extra and runs
+`ruff check .`, `mypy` and `python -m pytest`.
+
+## Build the source documentation
+
+The source uses Doxygen comments and the `Doxyfile` in the repository root. Install
+Doxygen (`winget install DimitriVanHeesch.Doxygen` on Windows,
+`sudo apt install doxygen` on Debian, `brew install doxygen` on MacOS), then run:
+
+```bash
+doxygen Doxyfile
+```
+
+The HTML documentation is written to `docs/doxygen/html/`; open `index.html` in a
+browser. The output folder is ignored by git.
+
+## Project layout
+
+```text
+.
+├── src/coffee_machine/   The program
+│   ├── constants.py      Menu, resources, coins, commands and messages
+│   ├── menu.py           Menu and MenuItem
+│   ├── coffee_maker.py   CoffeeMaker
+│   ├── money_machine.py  MoneyMachine
+│   ├── main.py           The loop that keeps the machine running
+│   └── __main__.py       Lets `python -m coffee_machine` start the program
+├── tests/                pytest tests
+├── docs/                 Project documents (business case, plan, milestones, reviews)
+├── Doxyfile              Doxygen configuration
+├── pyproject.toml        Project configuration
+└── .github/workflows/    Continuous integration
+```
+
+## License
+
+GNU Affero General Public License v3.0, see [LICENSE](LICENSE).