Add dag.json for domain configuration

domains/dag.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "daglaroglou",
+        "email": "christos.daglaroglou@gmail.com"
+    },
+    "records": {
+        "CNAME": "daglaroglou.github.io"
+    }
+}