Add TouchBridge to productivity-tools collection

[HMAKT99]

Please confirm this pull request meets the following requirements:

• I followed the contributing guidelines: https://github.com/github/explore/blob/main/CONTRIBUTING.md.
• This change is not self-promotion.

Which change are you proposing?

• Suggesting edits to an existing topic or collection
• Curating a new topic or collection
• Something that does not neatly fit into the binary options above

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Editing an existing topic or collection

I'm suggesting these edits to an existing topic or collection:

• Image (and my file is *.png, square, dimensions 288x288, size <= 75 kB)
• Content (and my changes are in index.md)

Adding TouchBridge to the productivity-tools collection. It's a tool that uses your phone's fingerprint to authenticate sudo on any Mac without Touch ID — a free alternative to the $199 Magic Keyboard. 167+ stars, listed in awesome-mac (101k stars).

[abhijithksa187-crypto]

2q

[kenyonj]

This isn't following the proper pattern to add a project to the front matter. Please fix.

also, please restore and fill out the pull request template.

[HMAKT99]

Updated the PR description to follow the template. The entry is in the items: list inside the front matter of collections/productivity-tools/index.md. Let me know if anything else needs fixing.