add a changelog entry

diff --git a/doc/news/changes/minor/202119Maier b/doc/news/changes/minor/202119Maier
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+Added: A multidimensional array dealii::ndarray that allows one to
+conveniently create "stacked" std::array objects that model a
+multidimensional array. `dealii::ndarray<double, 1, 2, 3, 4>` for example
+is a short-hand for `std::array<std::array<std::array<std::array<double, 4>, 3>, 2>, 1>`.
+<br>
+(Matthias Maier, 2021/02/19)