Should allow user to specify an account nickname

Summary:

For users to be able to quickly identify their accounts when doing transfers or payments, we should allow them to specify an account nickname.

We would have to decide if the account nickname is just stored locally in the app on the device or if the account nickname would be stored at the platform level for Apache Fineract.

Storing it the Apache Fineract level, would allow the user to have account nickname persist across the mobile and online banking apps.