add AppVeyor build status
add AppVeyor build status

For now it uses my own appveyor account.
Maybe it is possible to use an OpenSC team appveyor account or something like that instead.
AktivCo/OpenSC,kasparsd/opensc-latvia-id,mtrojnar/OpenSC,UIKit0/OpenSC,LudovicRousseau/OpenSC,philipWendland/OpenSC,jpki/OpenSC,tidatida/OpenSC,OpenSC/OpenSC,aobaid/OpenSC,hhonkanen/OpenSC,velter/OpenSC,l1k/OpenSC,kasparsd/opensc-latvia-id,martinpaljak/OpenSC,philipWendland/OpenSC,nmav/OpenSC,AktivCo/OpenSC,jpki/OpenSC,germanblanco/OpenSC,metsma/OpenSC,l1k/OpenSC,dengert/OpenSC,viktorTarasov/OpenSC-SM,UIKit0/OpenSC,frankmorgner/OpenSC,LudovicRousseau/OpenSC,tidatida/OpenSC,velter/OpenSC,philipWendland/OpenSC,Jakuje/OpenSC,LudovicRousseau/OpenSC,UIKit0/OpenSC,OpenSC/OpenSC,martinpaljak/OpenSC,mouse07410/OpenSC,Jakuje/OpenSC,frankmorgner/OpenSC,frankmorgner/OpenSC,hongquan/OpenSC-main,hongquan/OpenSC-main,Jakuje/OpenSC,nmav/OpenSC,AktivCo/OpenSC,l1k/OpenSC,germanblanco/OpenSC,frankmorgner/OpenSC,OpenSC/OpenSC,martinpaljak/OpenSC,fabled/OpenSC,fabled/OpenSC,tidatida/OpenSC,velter/OpenSC,mtrojnar/OpenSC,metsma/OpenSC,aobaid/OpenSC,hhonkanen/OpenSC,mouse07410/OpenSC,tidatida/OpenSC,rickyepoderi/OpenSC,CardContact/OpenSC,viktorTarasov/OpenSC-SM,CardContact/OpenSC,gemini/OpenSC,mouse07410/OpenSC,dengert/OpenSC,kasparsd/opensc-latvia-id,germanblanco/OpenSC,metsma/OpenSC,aobaid/OpenSC,jpki/OpenSC,kasparsd/opensc-latvia-id,UIKit0/OpenSC,viktorTarasov/OpenSC-SM,dengert/OpenSC,Jakuje/OpenSC,fabled/OpenSC,mtrojnar/OpenSC,hongquan/OpenSC-main,gemini/OpenSC,gemini/OpenSC,CardContact/OpenSC,aobaid/OpenSC,velter/OpenSC,hhonkanen/OpenSC,rickyepoderi/OpenSC,nmav/OpenSC,rickyepoderi/OpenSC,fabled/OpenSC