add demos to README.md

orx-timer/README.md

@@ -37,6 +37,11 @@ Note that drawing inside the `repeat` action has no effect. Have a look at the d
 ## Demos
 ### DemoRepeat01
 
+A simple demonstration on using the `repeat` method to execute a function
+at regular intervals.
+
+Note that drawing inside the repeat action has no effect.
+See DemoRepeat02.kt to learn how to trigger drawing.
 
 
 ![DemoRepeat01Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-timer/images/DemoRepeat01Kt.png)
@@ -45,14 +50,29 @@ Note that drawing inside the `repeat` action has no effect. Have a look at the d
 
 ### DemoRepeat02
 
-This demonstrates how to combine `repeat {}` with a postponed event to trigger drawing
+This demonstrates how to combine `repeat {}` with a postponed event to trigger drawing.
 
 ![DemoRepeat02Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-timer/images/DemoRepeat02Kt.png)
 
 [source code](src/demo/kotlin/DemoRepeat02.kt)
 
+### DemoRepeat03
+
+Shows how a `repeat` block can update a variable used
+for rendering. In this demo, the `opacity` variable is
+reduced on every animation frame, and increased to 1.0
+every 2 seconds, creating a pulsating animation effect.
+
+![DemoRepeat03Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-timer/images/DemoRepeat03Kt.png)
+
+[source code](src/demo/kotlin/DemoRepeat03.kt)
+
 ### DemoTimeOut01
 
+Demonstrates the `timeOut` function.
+
+It is similar to the `repeat` function,
+but it runs only once after the specified delay in seconds.
 
 
 ![DemoTimeOut01Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-timer/images/DemoTimeOut01Kt.png)