Add license to 6 books

[azamshaikh1103]

What does this PR do?

Add info based on #11355

For resources

Description

• Fullstack GraphQL
  License (CC BY-NC-SA) found on github's README license section

• Learning graphqL - Compiled from StackOverflow Documentation (PDF)
  License (CC BY-SA) found on page no.3 of PDF

• Gradle User Guide - Hans Dockter, Adam Murdoch (PDF)
  License (CC BY-NC-SA) found under the license section

• Hadoop Illuminated - Mark Kerzner, Sujee Maniyam
  License (CC BY-NC-SA) found in about section

• Learning Go
  License (CC BY-NC-SA) found in preface

• Let's learn Go!
  License (CC BY-NC-SA) found on footer

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!