Add Discord domain verification for arx.is-a.dev

domains/_discord.arx.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "arturious",
+    "email": "arturbakhtygereyev@gmail.com"
+  },
+  "records": {
+    "TXT": "dh=de804751f7e40ba5e586ad602b257b40879f285d"
+  }
+}