Include some tips

Author: Vectorial1024

README.md

@@ -45,7 +45,7 @@ If you are on Unix, check that you also have the following:
 ## Change log
 Please see `CHANGELOG.md`.
 
-## Example code
+## Example code and features
 Tasks can be defined as PHP closures, or (recommended) as an instance of a class that implements `AsyncTaskInterface`.
 
 A very simple example task to write Hello World to a file:
@@ -87,6 +87,11 @@ $task->withTimeLimit(15)->start();
 $task->withoutTimeLimit()->start();
 ```
 
+Some tips:
+- Don't sleep too long! On Windows, timeout handlers cannot trigger while your task is sleeping.
+  - Use short but frequent sleeps instead.
+- Avoid using `SIGINT`! On Unix, this signal is reserved for timeout detection. 
+
 ## Testing
 PHPUnit via Composer script:
 ```sh