added connecting snackbar and snackbar.dart file issue#465 #583
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Added 'snackbar.dart' file to show the snackbar. I have created this file inside widget folder and then imported it in app.dart and message_list.dart file .
working : I have used "connectivity_plus: ^5.0.2" package to implement this. This package allows developers to see the connectivity of device . This helps us to determine whether our device has active internet connection or not