Add SQL courses from Hyperskill to free-courses-en.md

[ikayz]

• Introduced "Introduction to SQL": A foundational course covering SQL basics, syntax, and essential operations. Learners will write queries and manage databases effectively.

• Added "Databases with SQL and Python": This course integrates Python with SQL, teaching users to interact with databases dynamically, enhancing application development skills.

What does this PR do?

Add resource(s)

For resources

Description

This PR adds two courses from Hyperskill that cover fundamental and intermediate SQL concepts. The courses focus on practical skills, enabling learners to effectively use SQL in various applications.

Why is this valuable (or not)?

These courses are valuable as they provide interactive and project-based learning experiences, which help reinforce knowledge through hands-on practice. The integration of Python with SQL also prepares learners for real-world data applications.

How do we know it's really free?

Both courses are offered on the Hyperskill platform, which provides free access to educational content. Registration is required but does not involve any payment.

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

This PR adds courses to the course list.

Checklist:

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

Follow-up

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

[eshellman]

have you gone throught this course? Is it AI generated?

[ikayz]

have you gone throught this course? Is it AI generated?

I have gone through the course and it's not AI-generated. The course has been there before ChatGPT and other AIs.

[github-actions[bot]]

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