Add portfolio of Preston Richey to README showcase (#4087)
Add portfolio of Preston Richey to README showcase (#4087)


gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,0x80/gatsby,mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,mingaldrichgan/gatsby,mingaldrichgan/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby