Added GDCR in Salzburg, Austria (#546)
Added GDCR in Salzburg, Austria (#546)

Thanks @Nagelfar !! Welcome!!! :tada: 

coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io