Added 3 new Python learning resources and fixed language specificatio…

[connectwithvanshika]

…n for CS Circles (German)

Added 3 new Python learning resources and fixed language specification for CS Circles (German)

What does this PR do?

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

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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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[github-actions]

Linter failed, fix the error(s):

free-programming-books/more/free-programming-interactive-tutorials-de.md
 8:1-11:80  warning  Alphabetical ordering: swap l.10 and l.9         alphabetize-lists      remark-lint
  9:3-9:48  warning  Remove trailing slash (https://www.py4e.com)     no-url-trailing-slash  remark-lint
11:3-11:43  warning  Remove trailing slash (https://pythontutor.com)  no-url-trailing-slash  remark-lint