add sleep feature

SUMMARY.md

@@ -111,6 +111,7 @@
   * [setAirplaneMode](api-reference/commands/setairplanemode.md)
   * [setLocation](api-reference/commands/setlocation.md)
   * [setOrientation](api-reference/commands/setorientation.md)
+  * [sleep](api-reference/commands/sleep.md)
   * [startRecording](api-reference/commands/startrecording.md)
   * [stopApp](api-reference/commands/stopapp.md)
   * [stopRecording](api-reference/commands/stoprecording.md)

api-reference/commands/sleep.md

@@ -0,0 +1,14 @@
+# sleep
+
+`sleep` pauses the flow execution for a specified duration.
+
+```yaml
+- sleep: 100     # Sleeps for 100ms (default unit is ms)
+- sleep: 1000ms  # Sleeps for 1000ms
+- sleep: 1s      # Sleeps for 1 second
+- sleep:
+    time: 2000
+    label: Pause for two seconds
+```
+
+Note: This command shouldn't be necessary in most situations. Use [assertVisible](./assertvisible.md) or [extendedWaitUntil](./extendedwaituntil.md) to wait for something to appear. This command should be used in situations where an external system is performing a task that you cannot see the effect of (e.g. server-side transaction processing), or a splash animation that cannot be represented in the Maestro hierarchy that needs to be awaited.

api-reference/commands/waitforanimationtoend.md

@@ -12,3 +12,5 @@ Can have an optional timeout (in milliseconds) after which, if the animation is
 - waitForAnimationToEnd:
     timeout: 5000
 ```
+
+If you're looking to add a fixed delay, use [sleep](./sleep.md) instead.