Update README.md

Signed-off-by: Chandra Keshav Mishra <[email protected]>

README.md

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 [![Maven Package upon a push](https://github.com/mosip/resident-services/actions/workflows/push_trigger.yml/badge.svg?branch=release-1.2.0)](https://github.com/mosip/resident-services/actions/workflows/push_trigger.yml)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=mosip_resident-services&id=mosip_resident-services&branch=release-1.2.0&metric=alert_status)](https://sonarcloud.io/dashboard?id=mosip_resident-services&branch=release-1.2.0)
 
+## Note: This branch is created to host updated testrig code for CRE checks.
 # Resident Services
 This repository contains the source code and design documents for MOSIP Resident Service. For an overview please refer [here](https://docs.mosip.io/1.2.0/modules/resident-services). This module exposes API endpoints for Resident UI (refer [Resident UI github repo](https://github.com/mosip/resident-ui/blob/master/README.md)).