Update group number

Author: nicolelim02

README.md

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 [![Review Assignment Due Date](https://classroom.github.com/assets/deadline-readme-button-22041afd0340ce965d47ae6ef1cefeee28c7c493a6346c4f15d667ab976d596c.svg)](https://classroom.github.com/a/bzPrOe11)
+
 # CS3219 Project (PeerPrep) - AY2425S1
-## Group: Gxx
 
-### Note: 
-- You can choose to develop individual microservices within separate folders within this repository **OR** use individual repositories (all public) for each microservice. 
-- In the latter scenario, you should enable sub-modules on this GitHub classroom repository to manage the development/deployment **AND** add your mentor to the individual repositories as a collaborator. 
-- The teaching team should be given access to the repositories as we may require viewing the history of the repository in case of any disputes or disagreements. 
+## Group: G28
+
+### Note:
+
+- You can choose to develop individual microservices within separate folders within this repository **OR** use individual repositories (all public) for each microservice.
+- In the latter scenario, you should enable sub-modules on this GitHub classroom repository to manage the development/deployment **AND** add your mentor to the individual repositories as a collaborator.
+- The teaching team should be given access to the repositories as we may require viewing the history of the repository in case of any disputes or disagreements.