Add Vercel TXT verification for hyunsu.is-a.dev

domains/_vercel.hyunsu.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "ehs208",
+        "email": "ehs208@naver.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=hyunsu.is-a.dev,ce6fd4f04bdc3d3236a4"
+    }
+}