Add Vercel domain configuration for khanhthanh

domains/_vercel.khanhthanh.json

@@ -0,0 +1,10 @@
+{
+    "description": "Tran Khanh Thanh portfolio",
+    "owner": {
+        "username": "khanhthanhdev",
+        "email": "thanhkt27507@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=khanhthanh.is-a.dev,b2886a340a99bf7a82c4"
+    }
+}