add _vercel.mapka verification.

domains/_vercel.mapka.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "Mapka21",
+    "email": "sees360@outlook.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=mapka.is-a.dev,a9011195ab62756a53b1"
+  }
+}