Finish the README and add the wiki in English, Danish and Bahasa Malaysia

Doxygen builds the source documentation without warnings.

Task: MIL-007#1
Task: MIL-007#2
Task: MIL-007#3

wiki/Home.md

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+# Turtle Crossing
+
+🌐 **English** · [Dansk](Home-da) · [Bahasa Malaysia](Home-ms)
+
+Day 23 of Udemy's *100 Days of Code: The Complete Python Pro Bootcamp*: a
+Crossy Road style game. Steer a turtle north across a busy road. Every
+crossing makes the cars faster; one collision ends the game.
+
+| Page | Read it when you want to |
+| --- | --- |
+| [Install](Install) | Clone the repository, create the `.venv` and run the game and the tests |
+| [Play](Play) | Learn the rules and the controls |
+| [Architecture](Architecture) | See how the code is split into modules and why |
+
+## At a glance
+
+- Python 3.13 or newer, standard library only at runtime.
+- Classes use the assignment's names: `Player`, `CarManager`, `Scoreboard`.
+- All constants live in `src/constants.py`.
+- Tests run with `pytest`; source documentation is built with Doxygen.
+
+## Links
+
+- [Repository][repo]
+- [README][readme]
+
+[repo]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/023-turtle-crossing
+[readme]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/023-turtle-crossing/src/branch/main/README.md