Add the curve definition and application examples for game development (#7543)

* Add the curve definition and application examples for game development

* chore: make the content concise and add links

There aren't much articles and videos for curves as a whole, most of them just have the definition. Creators prefer explaining individual curve types rather than all of them in one video but those should be linked into the sub-categories and that is already done.

src/data/roadmaps/game-developer/content/curve@YTkOF_33oL1ZkA-loc_DP.md

@@ -1 +1,8 @@
 ## Curve
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+A `curve` in game development is a mathematical tool for creating smooth lines or paths, used in areas like animation, 3D modeling, UI design, and level layouts. Curves simplify complex shapes and movements, enabling more natural results compared to linear approaches. They're key for `lifelike animations`, organic shapes, `realistic physics`, and smooth camera movements, essential for polished, fluid game design.
+
+Learn more from the following resources:
+
+- [@article@Curves wikipedia](https://en.wikipedia.org/wiki/Curve)
+- [@article@Curves basics](https://byjus.com/maths/curve/)