Add Highlights

[Ehsaan13]

Proposed change(s):

• Addition of Highlights to the list

Highlights is a research tool designed for researchers, with the ability to highlight, annotate and add images.

For more information:

https://highlightsapp.net/tutorials/mac/

https://apps.apple.com/gb/app/highlights-pdf-reader-notes/id1498912833

https://9to5mac.com/2020/04/11/highlights-pdf-reader-universal-purchase/

https://apps.apple.com/gb/story/id1658435006

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Types of Changes

What types of changes does your PR introduce? Put an x in all boxes that apply

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

Proposed Changes

Describe each of your changes here to communicate to the maintainers why we should accept this pull request.

1. If you're adding something to the list, be sure to explain why it should be added.
2. If you're fixing a bug or resolving a feature request, be sure to link to that issue.

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)

Further Comments

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