feat: add pseudoyu subdomain

domains/pseudoyu.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "pseudoyu",
+    "email": "pseudoyu@connect.hku.hk"
+  },
+  "records": {
+    "A": ["75.2.60.5"]
+  }
+}