Add NLMChem

[apoorvasrinivasan26]

Found NLMChem, a manually annotated full-text resource on chemicals in the biomedical literature. It contains 150 full-text journal articles selected both to be rich in chemical mentions and for articles where human annotation was expected to be most valuable. However, I saw NLM literature archive already on the list but wasn't sure if it included this dataset

[kjappelbaum]

Thanks, added it as a note to the NLM literature archive!