添加邀请码注册机制

Change-Id: I1a104074a36564ffb332e928e131af182eb30240
diff --git a/src/main/java/com/pt/constant/Constants.java b/src/main/java/com/pt/constant/Constants.java
index d277ea2..e8cecd3 100644
--- a/src/main/java/com/pt/constant/Constants.java
+++ b/src/main/java/com/pt/constant/Constants.java
@@ -23,4 +23,20 @@
             return value;
         }
     }
+
+    public enum UserLevel {
+        NEWBIE(0),
+        FRESH(1),
+        SENIOR(2),
+        MASTER(3);
+
+        private final int value;
+        UserLevel(int value) {
+            this.value = value;
+        }
+
+        public int getValue() {
+            return value;
+        }
+    }
 }