Update README.md

Author: mopsicus

Diff for: README.md

@@ -1,2 +1,5 @@
 # unity-ios-background-run
 Little iOS plugin for Unity to work app in background
+
+# note
+You should to know, it will not works in unity main thread! I mean all that works in Update() and other MonoBehaviour will paused on minimized. So, you have to run some operation in another thread and it will not paused.