add adaptive icon

[Dario415]

Changes:

1. What i did:

• add configuration for adaptive icon

2. What to test:

• Happy path
• Error handling

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How to get there

1. Flavor and login informations

flavor: staging

login: loomi

password: 12345678

2. Steps

• Do login
• Go to some app page

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Observations:

1. Known issues

• Put them here if there are any

2. Code review pratices

• Unecessary prints/log (ctrl+f -> [ print( ] )
• Unecessary comments (ctrl+f -> [ // ] )
• Code organization
• Naming of functions and variables
• Repeated code

[gabrielerego123]

Para o ícone mudar pro wifi, eu tive que rodar o comando:
flutter pub run flutter_launcher_icons
Será que não precisamos adicionar em alguma documentação? @lucasvps @Dario415