Please add README.md to markdown/thai

[eshellman]

This would be a great addition to the tahi books list at Free-Programming-Books. But the proposed link there makes it difficult to find the thai resource, and a link directly to markdown/thai doesn't help the user navigate the book. A thai language README page in that directory would solve the problem.

[JerryLead]

@eshellman Thanks for your advice. I've added the readme for Thai version. https://github.com/JerryLead/SparkInternals/tree/master/markdown/thai