Adding NEWS.md

Author: Juliette-Gerbaux

NEWS.md

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+# watervalues v2
+
+## Major changes
+
+* New method to calculate rewards based on marginal prices
+* Deleting inaccessible states and adding penalties on rule curves
+* Better and faster implementation of dynamic programming scheme
+
+## Minor changes
+
+* Simplification of package and Shiny interface
+* Non constant generating and pumping powers taken into account
+
+
+# watervalues v1
+
+* Initial version of the package