Add rust logos

[sibelly]

Thank you for contributing!

Please confirm this pull request meets the following requirements:

• [x] I followed the [contributing guidelines][contributing]:

Which change are you proposing?

• [x] Adding a new logo

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Adding a new logo

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

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