adding news

Author: thibautjombart

NEWS.md

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+# linelist 0.0.1
+
+This is the first proof-of-concept release on CRAN.
+
+## New features
+
+* the `linelist` class implements a tagging system to keep track of key
+  epidemiological variables in a `data.frame`
+  
+* validation routines for tagged variables
+
+* accessors to retrieve tagged variables
+
+* an API for easy extension to additional tagged variables
+
+* dedicated S3 methods providing safeguards for operations which could lose
+  tagged variables
+
+* full documentation of all functions
+
+* a vignette
+
+* 100% test coverage
+
+