Connect POST and PUT requests for adding and updating items to the UI

Description

• Added POST request to Add page, and PUT request to Edit page so that the user

Issue

Issue #

Feature

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Tophatting

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Expected current behavior

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Changes

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Screenshots

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Design Patterns

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Deviations

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Additional

• Unit test written
• Meets requirements
• Cross-browser tested
• Added/updated documentation as needed
• Camel case style used