Add automatic gemini ai pull-request reviewer

[GREENRAT-K405]

Hello @pradeeban @Rahuljagwani I have configured the gemini bot. I would like to try it out in concore-lite.

[pradeeban]

@GREENRAT-K405 great. I have followed the steps for concore-editor and concore too. So, if you confirm it is working here, then you can submit similar PRs to those two repositories as well.