Adding myPOS2017 dataset
I've updated the code and Readme to reflect your comments.
Thank you very much, looks like this PR includes changes about many other files than the ones for myPOS2017

Could you open another branch and another PR please ?
(or fix this branch) Hi @hungluumfc ! Have you had a chance to fix this PR so that it only includes the changes for `mypos` ? 

Feel free to ping me if you have questions or if I can help :) 
myPOS Corpus (Myanmar Part-of-Speech Corpus) for Myanmar language NLP Research and Developments