What does this PR do?

Add resource(s), improve IDE and text editors (EN) section

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For resources

Description

• New Book : Visual Studio Code - The Essentials

  • "This book is currently a public preview. We are actively working on improving the content and adding more chapters." -- associated github page

  • so it's a "in-progress" book.
• fix dead link for "A Byte of Vim", adding missing authors, author full name
• 'Visual Studio 2019 Succinctly' : 'HTML' > 'online' for listing formats

Why is this valuable (or not)?

How do we know it's really free?

for "Visual Studio Code - The Essentials": see the notice page

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

• Check the status of GitHub Actions and resolve any reported warnings!