[AutoPR signalr/resource-manager] Add signarl/resource-manager/readme.typescript.md#3504

AutorestCI wants to merge 1 commit intomasterAzure/azure-sdk-for-python:masterfrom

restapi_auto_daschult/signalrAzure/azure-sdk-for-python:restapi_auto_daschult/signalrCopy head branch name to clipboard