add ntcir to index

resources/index.md

@@ -12,6 +12,7 @@ title: SIGMathLing - Datasets and Resources
  1. [quantity expressions](/resources/quantity-expressions)
  1. [arXMLiv word embeddings, 08.2017 release](/resources/arxmliv-embeddings-082017)
  1. [arXMLiv corpus, 08.2017 release](/resources/arxmliv-dataset-082017/)
+ 1. [NTCIR Math Information Retrieval data](/resources/ntcir)
 
 ## Work-In-Progress Resources hosted on the SIGMathLing Repository
  1. [Dataset for Grounding of Formulae](/resources/grounding-dataset)