Is your feature request related to a problem? Please describe.
Users sometimes miss critical app updates such as tasks since they need to open the app first to view updates.

Describe the solution you'd like
CHT/cht-android needs to have some notifications for users as a way to remind/ inform users on app activities such as pending tasks and incoming messages.
Currently the user needs to open the app's tasks/messages tab to get and update on these items.
A notification feature can help in the usability by managing interactions with the app.