added announcement for new data set (quantity expressions)

_posts/2018-03-29-quantity-expressions-dataset.md

+---
+layout: post
+title: Quantity Expressions Data Set
+---
+A new data set with annotations for quantity expressions has been uploaded to SIGMathLing.
+The content of this data set is licensed to [SIGMathLing members](/member/) for research
+and tool development purposes subject to the [SIGMathLing Non-Disclosure-Agreement](/nda/).
+
+The annotations were generated automatically for a dataset of roughly 35000 documents
+with an F-Score of 83%.
+
+Details can be found on the corresponding [resource page](/resources/quantity-expressions/).
+
+