Add user permission level notes

Signed-off-by: Asai Neko <sugar@sne.moe>

data/user.go

@@ -8,6 +8,12 @@ import (
 	"gorm.io/gorm/clause"
 )
 
+// Permission Level
+// Banned User: 0
+// Normal User: 10
+// Admin User: 20
+// Super User: 30
+
 type User struct {
 	Id              uint      `json:"id" gorm:"primarykey;autoincrement"`
 	UUID            uuid.UUID `json:"uuid" gorm:"type:uuid;uniqueindex;not null"`