feat: add array/float16

[udaykakade25]

Resolves Itself { stdlib-js/google-summer-of-code#94 }

Description

What is the purpose of this pull request?

This pull request:

• Adds file structure for array/float16 folder

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves itself.

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[udaykakade25]

Hello @kgryte sir.
I have created a file structure for array/float16 and am currently working to create polyfill.js and add rest of float16/lib/* files.
Please let me know if this requires any changes.

[kgryte]

The structure looks fine thus far.