Adding new starter gatsby-starter-typescript (#3030)
Adding new starter gatsby-starter-typescript (#3030)

Adding link to gatsby-starter-typescript, a TypeScript version of gatsby-starter-default.
ChristopherBiscardi/gatsby,fabrictech/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,Khaledgarbaya/gatsby,fk/gatsby,mingaldrichgan/gatsby,fk/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,Khaledgarbaya/gatsby,mingaldrichgan/gatsby,danielfarrell/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,danielfarrell/gatsby,0x80/gatsby,danielfarrell/gatsby,mingaldrichgan/gatsby,fabrictech/gatsby,fabrictech/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,Khaledgarbaya/gatsby,fk/gatsby