From Categories: + Add Phrase Button Saving Functionality

User story: As a user, I want the new phrase I saved to appear on top of the category where I clicked "+ Add Phrase" button from

Acceptance Criteria:

When user saves the phrase, they get toast confirmation that the phrase was saved.
If the phrase is a duplicate, user gets an alert message letting them know that the phrase already exists and can choose to create duplicate or cancel
Once phrase is saved, user is taken back to the preset category where they opened the keyboard from
Once saved, the new phrase appears at the beginning of the category where it was saved on.

Design:
Android designs need updating but iOS design can be used as a guide.