Add documentation for GitHub Pages

[HarshKapadia2]

To be added to the GitHub section (#5)

[Riya-code]

@HarshKapadia2 Can you please ellaborate a bit? I think I'll able to make the required changes.

[HarshKapadia2]

Please cover the following questions in points (no QnA) (points can be combined):

• What is GitHub Pages?
• Is it free? (Yes)
• Which type of web sites can be hosted using it? (Only static web sites)
• How can one set it up? (The official web site covers this)

Feel free to add anything else related to GitHub Pages.

The file needs to be placed in the GitHub section of the web site.

NOTE: Do go through the CONTRIBUTING.md file for Asciidoctor and local project setup instructions.

[HarshKapadia2]

Let me know if you are willing to take this issue up @Riya-code (so that I can assign you to it).

[Riya-code]

Yes I can take it.

[HarshKapadia2]

• Add about the gh-pages orphan branch
  • Check if the branch HAS to be named that.
  • Need
  • Creation mentioned in a comment of issue Features to be added to the git commands section. #6.
  • Check if there are other ways to build an orphan branch (ie, using the git branch command.)

[HarshKapadia2]

• Let any files or folders that start with _, . or # or end with ~ be built.