Add fsharp programming Language, with love.

[alibaghernejad]

Thank you for contributing!

Please confirm this pull request meets the following requirements:

• [x] I followed the contributing guidelines:

Which change are you proposing?

• [ ] Suggesting edits to an existing logo
• [x] Adding a new logo

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Editing an existing topic or collection

I'm suggesting these edits to an existing logo:

• [ ] Image (and my file is *.png, square, dimensions 2048x2048)

Adding a new logo

• [x] I've formatted my changes as a new folder directory, named for the programming language.
• [x] My folder contains a *.png image, square, with 2048x2048 dimensions.

What to add something?

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