Add license tags to Go Books

[azamshaikh1103]

What does this PR do?

Add info based on #11355

For resources

Description

• Build Web Application with Golang - astaxie
  License found under the license section below

• Essential Go - Krzysztof Kowalczyk, StackOverflow Contributors
  License found on the last line of introduction

• Essentials of Go Programming - Baiju Muthukadan (HTML)
  License found under the license section

• The Little Go Book - Karl Seguin (PDF, ePUB)
  License found on github's README license section

• Web apps in Go, the anti textbook
  License found on github's README license section

For book lists, is it a book? For course lists, is it a course? etc.

• It's a 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!

[eshellman]

Thanks, and welcome to free-programming-books!

[azamshaikh1103]

Hey @eshellman, will there be any hacktoberfest issues?
If it'll be there then I'd love to solve it

[eshellman]

see #11259