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Setup.md

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+# Setup
+
+🌐 **English** · [Dansk](Setup-da) · [Bahasa Melayu](Setup-ms)
+
+You need Python 3.13 or newer.
+
+```bash
+python -m venv .venv
+```
+
+Activate the environment. Windows PowerShell: `.venv\Scripts\Activate.ps1`. Windows cmd: `.venv\Scripts\activate`. Linux and macOS: `source .venv/bin/activate`.
+
+```bash
+python -m pip install --upgrade pip
+python -m pip install -e ".[dev]"
+```
+
+![Creating the .venv](https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/032-birthday-wisher/raw/branch/main/docs/images/venv-setup.png)
+
+The `dev` extra installs pytest, ruff and mypy. Nothing is needed to run the program itself.