Update free-courses-pl.md

[SrishBansal]

Added new pandas course for python in polish in the free-courses-pl.md

What does this PR do?

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

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:

• Read our contributing guidelines.
• 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!

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
117:1-123:101  warning  Alphabetical ordering: swap l.123 and l.122  alphabetize-lists  remark-lint

[SrishBansal]

I have added new pandas course for python in polish in the free-courses-pl.md. Please review the code change

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
117:1-123:81  warning  Alphabetical ordering: swap l.123 and l.122  alphabetize-lists  remark-lint

[eshellman]

For youtube, we prefer "playlist" links and the name of the producer/creator. docs/CONTRIBUTING.md#platforms-and-access-notes

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
117:1-123:118  warning  Alphabetical ordering: swap l.123 and l.122  alphabetize-lists  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
117:1-123:117  warning  Alphabetical ordering: swap l.123 and l.122                            alphabetize-lists  remark-lint
117:1-123:117  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
          1:1  warning  Missing newline character at end of file                               final-newline      remark-lint
117:1-123:117  warning  Alphabetical ordering: swap l.123 and l.122                            alphabetize-lists  remark-lint
117:1-123:117  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-pl.md
          1:1  warning  Missing newline character at end of file                               final-newline      remark-lint
117:1-123:141  warning  Alphabetical ordering: swap l.122 and l.121                            alphabetize-lists  remark-lint
117:1-123:141  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint