Add nxarray to related-projects.rst (#3848)

Author: mpanighel

doc/related-projects.rst

@@ -61,6 +61,7 @@ Extend xarray capabilities
 - `Collocate <https://github.com/cistools/collocate>`_: Collocate xarray trajectories in arbitrary physical dimensions
 - `eofs <https://ajdawson.github.io/eofs/>`_: EOF analysis in Python.
 - `hypothesis-gufunc <https://hypothesis-gufunc.readthedocs.io/en/latest/>`_: Extension to hypothesis. Makes it easy to write unit tests with xarray objects as input.
+- `nxarray <https://github.com/nxarray/nxarray>`_: NeXus input/output capability for xarray.
 - `xarray_extras <https://github.com/crusaderky/xarray_extras>`_: Advanced algorithms for xarray objects (e.g. integrations/interpolations).
 - `xrft <https://github.com/rabernat/xrft>`_: Fourier transforms for xarray data.
 - `xr-scipy <https://xr-scipy.readthedocs.io>`_: A lightweight scipy wrapper for xarray.