Include github-org-analyzer under tutorial/github-org-analyzer

[milancurcic]

@rajkumardongre I noticed that the github-org-analyzer project is in a separate repo: https://github.com/rajkumardongre/github-org-analyzer

What do you think about including it under http-client repo in tutorial/github-org-analyzer directory? I think it would helpful to have the full code there, and maintain it under http-client.

[rajkumardongre]

Yes, that sounds promising. I will proceed with making the necessary changes.

[rajkumardongre]

Added in #56