Add DisplayBuddy

[biocross]

Types of Changes

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• New addition to list
• Fixing bug in existing item in list
• Removing item from list
• Changing structure (organization) of list

Proposed Changes

Adding a new app DisplayBuddy - which is a handy utility to control the brightness, contrast, input source, and other features of external displays directly from the Mac menu bar. (Website: https://displaybuddy.app)

PR Checklist

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• I have read the CONTRIBUTING guide
• I have explained why this PR is important
• I have added necessary documentation (if appropriate)

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