Adds Tempo

[justin-schroeder]

Checklist:

• [x] I've read and understood Contributing Guidelines.
• [x] I've added the new resource at the end of its section.
• [x] This resource is out there for a while, and actively maintained.
• [x] This resource is popular enough and has at least a few hundred stars on GitHub.

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Adds Tempo — a date library for working with native Date objects with Timezone support, formatting and parsing.

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