Add three Rust courses

[Tejas-Santosh-Nalawade]

• Add Rust Programming Tutorial by Trevor Sullivan
• Add Learn Rust by Smart Contract Programmer
• Add Rust Crash Course Tutorial for Beginners by Francesco Ciulla

All entries properly formatted and placed in alphabetical order within the Rust section.

What does this PR do?

Add resource(s) | Remove resource(s) | Add info | Improve repo

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For resources

Description

Why is this valuable (or not)?

How do we know it's really free?

For book lists, is it a book? For course lists, is it a course? etc.

Checklist:

• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

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[Tejas-Santosh-Nalawade]

@eshellman Please Review it and merge tell if any changes

[eshellman]

Thanks, and welcome to free-programming-books!