feat: ajout des pallier de competences

classes/dataholders/competenceholder.lua

@@ -10,9 +10,11 @@ function Competence:new(name)
 end
 
 function Competence:reduce(level)
+    local baseValue = self.base + (self.lvl * level) + self.bonus + self.add
+
     return {
         name = self.name,
-        value = self.base + (self.lvl * level) + self.bonus + self.add
+        value = math.floor(baseValue / 5) * 5
     }
 end