Xanathar's guide to everything introduced racial feats to D&D 5e, but they never gave anything to the races and monstrous races in Volo's guide as far as i know. i was wondering if anyone in the community has created anything  or have any ideas for feat the monster races in dnd. 

You can search the Feats here. Try putting the race you're looking for into the 'Description' field and searching. I just searched for Kobold, for example, and got several homebrew feats with Kobold race as prereq. https://www.dndbeyond.com/homebrew/feats?filter-name=&filter-description=kobold&filter-author=&filter-author-previous=&filter-author-symbol=&filter-rating=-10