Add Vercel comments domain verification JSON

domains/_vercel.comments.zjy.json

@@ -0,0 +1,8 @@
+{
+  "owner": {
+    "username": "Jingyuan-Zheng"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=comments.zjy.is-a.dev,0fddaba082fbf6861b72"
+  }
+}