Add some brief instructions for coding style guidelines
Add some brief instructions for coding style guidelines

elderbas/vimium,willsALMANJ/vimium,elderbas/vimium,csmalin/vimium,tuchangwei/vimium,elderbas/vimium,borgified/vimium,llimllib/vimium,justalittlenoob/vimium,jb55/vimium-plus,elegantwww/vimium,cyrixhero/vimium,smblott-github/vimium,willsALMANJ/vimium,zhangmin510/vimium,Lw-Cui/vimium,PrestanceDesign/vimium,wildeyes/vimium,hhsue/vimium,hhsue/vimium,wildeyes/vimium,poacher2k/vimium,cyrixhero/vimium,smblott-github/vimium,philc/vimium,tuchangwei/vimium,zhangmin510/vimium,Aleroniponi/vimium,bkudria/vimium,PickRelated/vimium,dimatter/vimium,PrestanceDesign/vimium,csmalin/vimium,philc/vimium,douglas-larocca/vimium,smblott-github/vimium-smblott,cyrixhero/vimium,crazypenguincode/vimium,smblott-github/vimium,decaffeinate-examples/vimium,Lw-Cui/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,bkudria/vimium,mrmr1993/vimium,elegantwww/vimium,decaffeinate-examples/vimium,dimatter/vimium,dimatter/vimium,poacher2k/vimium,Robinson10240/vimium,willsALMANJ/vimium,Robinson10240/vimium,douglas-larocca/vimium,justalittlenoob/vimium,wildeyes/vimium,gdh1995/vimium,Lw-Cui/vimium,zhangmin510/vimium,crazypenguincode/vimium,gdh1995/vimium,shaung/vimium,csmalin/vimium,hhsue/vimium,PickRelated/vimium,douglas-larocca/vimium,Aleroniponi/vimium,VPashkov/vimium,smblott-github/vimium-smblott,VPashkov/vimium,borgified/vimium,justalittlenoob/vimium,Aleroniponi/vimium,PrestanceDesign/vimium,elegantwww/vimium,poacher2k/vimium,borgified/vimium,Robinson10240/vimium,bkudria/vimium,VPashkov/vimium,PickRelated/vimium,gdh1995/vimium,philc/vimium,mrmr1993/vimium,jb55/vimium-plus,tuchangwei/vimium