Add unreal engine resources (#6638)

src/data/roadmaps/game-developer/content/unreal-engine@a6H-cZtp3A_fB8jnfMxBR.md

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 # Unreal Engine
 
 The **Unreal Engine** is a powerful game development engine created by Epic Games. Used by game developers worldwide, it supports the creation of high-quality games across multiple platforms such as iOS, Android, Windows, Mac, Xbox, and PlayStation. Unreal Engine is renowned for its photo-realistic rendering, dynamic physics and effects, robust multiplayer framework, and its flexible scripting system called Blueprint. The engine is also fully equipped with dedicated tools and functionalities for animation, AI, lighting, cinematography, and post-processing effects. The most recent version, Unreal Engine 5, introduces real-time Global Illumination and makes film-quality real-time graphics achievable.
+
+- [@official@Unreal Engine Documentation](https://dev.epicgames.com/documentation/en-us/unreal-engine/unreal-engine-5-4-documentation)
+- [@official@Unreal Engine YouTube Channel](https://m.youtube.com/channel/UCBobmJyzsJ6Ll7UbfhI4iwQ)
+- [@video@Unreal in 100 Seconds](https://www.youtube.com/watch?v=DXDe-2BC4cE)
+- [@feed@Unreal Source Discord](https://discord.gg/unrealsource)