Added Let's Talk Python

[stjepanjurekovic]

Hi,

Stjepan from Manning here. We have a new Python book appropriate for children to learn Python. Thank you for considering adding it to your list.

Best,

[JamesLavin]

Thanks, @stjepanjurekovic.

Apologies for not getting to this till now. I'll be happy to merge this, but I see three small issues:

1. The URL now redirects to https://www.manning.com/books/a-pythonic-adventure
2. The book's title has apparently changed to "A Pythonic Adventure"
3. All resources on my pages should either be free or marked with a "(💰NON-FREE💰)" at the end of their title. Since this is a non-free, book, please add the "(💰NON-FREE💰)"

Thank you,

James