Navigation Toolbar title in fragments

[rogergcc]

override from title app to each title fragment

Fragment 1 title :app_name ❌ Fragment 2 title :app_name ❌

Fragment 1 title :Fragment 1 🆗 Fragment 2 title :Fragment 2 🆗

viewmodel scop in viewmodel

[rogergcc]

resolved in commit 9634d45f 9634d45