Add README hero and animation gallery

README.md

@@ -1,5 +1,7 @@
 # Aither
 
+![Aither — Living particle orbs for SwiftUI](Media/hero.jpg)
+
 Aither is a dependency-free package for expressive, continuously looping
 particle orbs. Its primary API is native SwiftUI, backed by an efficient
 UIKit/Core Graphics renderer that can also be used directly.
@@ -42,6 +44,20 @@ AitherOrb()
 network activity. When SwiftUI state changes, Aither updates the existing
 renderer instead of recreating it.
 
+## Animation gallery
+
+| Aither | Zētēsis |
+| :---: | :---: |
+| ![Aither animation](Media/GIFs/energeia.gif) | ![Zētēsis animation](Media/GIFs/zetesis.gif) |
+| **Lysis** | **Akroasis** |
+| ![Lysis animation](Media/GIFs/lysis.gif) | ![Akroasis animation](Media/GIFs/akroasis.gif) |
+| **Synthesis** | **Morphōsis** |
+| ![Synthesis animation](Media/GIFs/synthesis.gif) | ![Morphōsis animation](Media/GIFs/morphosis.gif) |
+| **Periphora** | **Diodos** |
+| ![Periphora animation](Media/GIFs/periphora.gif) | ![Diodos animation](Media/GIFs/diodos.gif) |
+| **Krystallos** | **Systolē** |
+| ![Krystallos animation](Media/GIFs/krystallos.gif) | ![Systolē animation](Media/GIFs/systole.gif) |
+
 ## Data-driven motion
 
 Drive motion directly from SwiftUI state: