Doc AI incubator tools

[bharadwajreddyvangimalla]

Few Doc AI incubator tools are added into the folder and gist of the tools are updated in the readme.md file

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[holtskinner]

Thank you for making this PR.

Couple of notes

1. @bharadwajreddyvangimalla Fill out https://cla.developers.google.com/ with your GitHub username (Needed to commit to Google official repos)
2. I didn't realize the plan was to share these as PDFs. Could they be turned into Jupyter Notebooks instead to make code usage easier?

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[holtskinner]

@bharadwajreddyvangimalla Does this PR need to stay open since #640 has gone through?

[bharadwajreddyvangimalla]

@bharadwajreddyvangimalla Does this PR need to stay open since #640 has gone through?

You can reject this pull request as deepak has created one with all the updates you have asked