Add ducph4t.is-a.dev and vercel verification

domains/_vercel.ducph4t.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "DucPh4t",
+    "email": "nguyenducphat.edu@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=ducph4t.is-a.dev,9fbf6f6af486a470a80b"
+  }
+}

domains/ducph4t.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "DucPh4t",
+    "email": "nguyenducphat.edu@gmail.com"
+  },
+  "records": {
+    "CNAME": "cname.vercel-dns.com"
+  }
+}