Add khanhthanh.json for portfolio details

domains/khanhthanh.json

@@ -0,0 +1,10 @@
+{
+    "description": "Tran Khanh Thanh portfolio",
+    "owner": {
+        "username": "khanhthanhdev",
+        "email": "thanhkt27507@gmail.com"
+    },
+    "records": {
+        "A": "216.198.79.1"
+    }
+}