Allow enter key to add new boards, lists, and cards

[jeffslofish]

Description

keyDown handlers are added that check for the "Enter" key being pressed when editing boards, lists, or cards. If "Enter" is pressed, then the board, list, or card is created immediately, instead of the user having to press the button with the mouse.

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Fixes # (issue reference) Fixes #46

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Expected Outcome

Additional Information

[ayushagg31]

Thanks for the contribution @jeffslofish.