Add Unity https://framagit.org/reverseeagle/project-management/-/issues/4#note_756893

replace/unity.md

+---
+product: Unity
+type: "Unity is a cross-platform game engine"
+layout: replace
+---
+
+# Unity
+
+## Godot
+
+Godot is a 2D and 3D, cross-platform, free and open-source game engine. The development environment runs on multiple operating systems including Linux, macOS, and Windows. Godot can create games targeting PC, mobile, and web platforms.
+
+{% infobox %}
+  - **Website**: [godotengine.org](https://godotengine.org/)
+  - **Source code**: [GitHub](https://github.com/godotengine/godot)
+  - **License**: [MIT](https://github.com/godotengine/godot/blob/master/LICENSE.txt)
+{% endinfobox %}