GitLab

* update contamination docs

* add citation

* Update contamination_eval.md

* Update contamination_eval.md

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Co-authored-by: Songyang Zhang <tonysy@users.noreply.github.com>

* add contamination analysis to ceval

* fix bugs

* add contamination docs

* to pass CI check

* update

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Co-authored-by: zhangyifan1 <zhangyifan1@pjlab.org.cn>
Co-authored-by: Leymore <zfz-960727@163.com>