2 Book License Add

[IamNitinShukla]

What does this PR do?

Add info according to issue #11355

For resources

Description

Add License Notes to following books:

1. Think Python First Edition - Allen B. Downey (2.x) (HTML, PDF)

License Line found on page 4 of pdf

Permission is granted to copy, distribute, and/or modify this document under the terms of the
Creative Commons Attribution-NonCommercial 3.0 Unported License, which is available at http:
//creativecommons.org/licenses/by-nc/3.0/.

2. Raku Guide (HTML)

License Line found under License heading on html page

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit
https://creativecommons.org/licenses/by-sa/4.0/.

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!

[eshellman]

Thanks, and welcome to free-programming-books!