text: 
  #Autor: Brian E
  #Fecha: 06 Mayo 2021
  #Contacto: brian@mail.com
  #Descrption: Navbar With Icons with KivyMD
  
  from kivy.lang import Builder
  from kivymd.app import MDApp
  
  class MainApp(MDApp): 
      def build(self):
          self.theme_cls.theme_style = "Dark"
          self.theme_cls.primary_palette = "BlueGray"
          return Builder.load_file('how.kv')
  
  MainApp().run()