please add reward model eval scripts

[akk-123]

Describe the feature

@ht-zhou I notice RM training and training result is updated, can you share the eval data and scripts?
what' more, I think you cite the wrong paper, It should be https://arxiv.org/pdf/2204.05862.pdf

[Camille7777]

hi, @akk-123, thanks for your suggestion, and the paper link has been updated.