Added openshift cname instructions
Added openshift cname instructions
mike1pol/slackin,18F/slackin,18F/slackin,lemonlabsuk/slack-invite-page,Milwaukee-Slack/Milwaukee-Slack-Invite-Website,atom/slackin,martindale/slackin,TibiaPF/slackin,thanosIrodotou/slackin,TechnologyMasters/technologymasters.herokuapp.com,rauchg/slackin,Milwaukee-Slack/Milwaukee-Slack-Invite-Website,IOT-DSA/slackin,Ineeza/luka_ineeza_slakin,Venpath/slackin,thanosIrodotou/slackin,PHPSP/slackin,Venpath/slackin,ouluwebdev/slackin,edorgeville/slackin-fr,szkl/slackin,szkl/slackin,ouluwebdev/slackin,mbbroberg/slackin,PHPSP/slackin,emccode/community,Code-T/slackin,avaclancheuk/slackin,mike1pol/slackin,JoomSavvy/aauj,emccode/community,mbbroberg/slackin,thanosIrodotou/slackin,JLPcommunity/join-slackin,devopsnz/slackin,TechnologyMasters/technologymasters.herokuapp.com,emccode/community,Code-T/slackin,IOT-DSA/slackin,edorgeville/slackin-fr,lemonlabsuk/slack-invite-page,devopsnz/slackin,Ineeza/luka_ineeza_slakin,avaclancheuk/slackin,rauchg/slackin,TibiaPF/slackin