update readme

Signed-off-by: Tihomir Surdilovic <[email protected]>

Author: tsurdilo

core/src/main/java/io/temporal/samples/packetdelivery/README.md

@@ -8,6 +8,13 @@ Workflow waits until all packets have been delivered. Each packet delivery path
 also "cancel" delivery of another item. This is done via signal and cancellation of the 
 CancellationScope. 
 
+## Notes
+1. In this sample we do not handle event history count and size partitioning via ContinueAsNew. It is assumed
+that the total number of paths and path lengths (in terms of activity executions) would not exceed it. 
+For your use case you might need to add ContinueAsNew checks to deal with this situation.
+2. Use this sample as all other ones as reference for your implementation. It was not tested on high scale 
+so using it as-is without load testing is not recommended.
+
 ## Start the Sample:
 ```bash
 ./gradlew -q execute -PmainClass=io.temporal.samples.packetdelivery.Starter