Add NewsPH_NLI dataset
This PR adds the NewsPH-NLI Dataset, the first benchmark dataset for sentence entailment in the low-resource Filipino language. Constructed through exploting the structure of news articles. Contains 600,000 premise-hypothesis pairs, in 70-15-15 split for training, validation, and testing.

Link to the paper: https://arxiv.org/pdf/2010.11574.pdf

Link to the dataset/repo: https://github.com/jcblaisecruz02/Filipino-Text-Benchmarks