Create Update/Create Transaction dialog box

[artballesteros]

Create a dialog box that can

• add a transaction to an account
• take an older transaction from the individuals account screen and update it
• define a basic popup_content.xml (this is what will be displayed in the dialog box)

note: Below is a guide by Codepath on how to do this.
https://guides.codepath.com/android/menus-and-popups#popup-window

You will probably also update the adapter for the RecyclerView in the Individual Accounts Screen for every new transaction you add.
https://guides.codepath.com/android/Using-the-RecyclerView