updated readme

Author: Geolm

README.md

@@ -2,7 +2,22 @@
 
 Uniform sampling in combined shapes with overlap handling and distance constraints.
 
+![demo](media/spawn2d.apng)
+
+---
+
+## Features
+- Uniform sampling in **aggregated shapes** (combination of multiple shapes)
+  - discs  
+  - axis-aligned bounding boxes (AABB)  
+  - oriented bounding boxes (OBB)  
+  - ellipses  
+- Exclusion shapes  
+- Optional minimum-distance constraint  
+- Uniform sampling along a Catmull-Rom spline with adjustable width  
+- Deterministic RNG (SplitMix32)  
+- C11, no dynamic allocation, no external dependencies  
+- Only **two** functions in the API
+
+
 
-<video width="640" autoplay loop muted controls>
-  <source src="video/spawn2d.mp4" type="video/mp4">
-</video>