Add links to italian readme to all other readme

[Pietrob5]

Proposed changes

I added links to README_it.md in all other README files to maintain consistent style in the documentation and completeness in internal links. Just a quik and easy fix!

Types of changes

What types of changes does your content introduce to this project?
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• Proofreading (fix spelling, grammar, punctuation, accuracy) Proofreading
• New content (new section, new readme, etc.)
• Modifications (modifying existing content)
• Other (please describe)

Checklist

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• Tested any code that was added/modified in this PR
• Added external links
• Added internal links
• Added images
• Added videos
• Added code snippets

Further comments

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Adding your name to the contributor's list

Comment "@all-contributors please add @your_username for content" to add your name to the contributor's list.
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[the-label-bot]

The Label Bot has predicted the following:

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[shhossain]

Merging.