added CNAME file for serving project on custom domain
added CNAME file for serving project on custom domain

gdgistanbul/wtm-istanbul16,gdgistanbul/wtm-istanbul16,gdgistanbul/wtm17,gdgistanbul/wtm-istanbul16,gdgistanbul/wtm17,gdgistanbul/wtm16,gdgistanbul/wtm16,gdgistanbul/wtm16,gdgistanbul/wtm17