add contact us

Author: ericrgz

src/protocol/pay-per-task.md

@@ -40,3 +40,8 @@ Use the iExec SDK to **set the category** in app, request, or workerpool
 orders.  
 For commands and examples, see the
 [iExec SDK Github repository](https://github.com/iExecBlockchainComputing/iexec-sdk/blob/master/docs/README.md).
+
+::: info Need help
+Can’t find an order that fits your needs or unsure which category to choose?
+[Contact us on Discord](https://discord.com/invite/pbt9m98wnU) and we will help you pick the right setup.
+:::