Update free-programming-books-pt_BR.md

[Feofiloff]

What does this PR do?

Add resource.

For resources

Description

Added HTML book "Algoritmos para Grafos (via Sedgewick)" by Paulo Feofiloff.

Why is this valuable (or not)?

How do we know it's really free?

For book lists, is it a book?

It is a site having the features of an HTML book.

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!

[Feofiloff]

Hmmm. I'm new to this.

What check failed? Why did it fail?

[eshellman]

Be sure to check the free-programming-books-lint output for linter errors. Alphabetical order and spacing are the most common problems.