Add sehan.json with domain owner and records

domains/sehan.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "Dhaneera",
+    "email": "wickramasuriyashehan@gmail.com"
+  },
+  "records": {
+    "CNAME": "portfolio-steel-chi-3afsh55p91.vercel.app"
+  }
+}