List classes demonstrated in app

Author: chiuki

README.md

@@ -1,7 +1,16 @@
 Android Graphics Demo
 ---------------------
 
-Companion app for my [Android Shaders and Filters talk][1].
+Companion app for my [Android Shaders and Filters talk][1], demonstrating:
 
-  [1]: http://chiuki.github.io/android-shaders-filters
+ * `LinearGradient`
+ * `BitmapShader`
+ * `ColorMatrixColorFilter`
+ * `LightingColorFilter`
+ * `PorterDuffXfermode`
+ * `EmbossMaskFilter`
+ * `BlurMaskFilter`
+ * `ScriptIntrinsicBlur`
+ * `ScriptIntrinsicConvolve3x3`
 
+  [1]: http://chiuki.github.io/android-shaders-filters