Add DeLTA to the list of software using xarray (#2)

Author: Armavica

existing-software.md

@@ -10,5 +10,9 @@ Do you know of something that should be included here? Please open an Issue or P
 - [spatial-data](https://spatialdata.scverse.org/en/latest/index.html) and the packages that build uses `Xarray`
     - Internally it uses the [multi-scale-spatialimage](https://github.com/spatial-image/multiscale-spatial-image?tab=readme-ov-file#multiscale-spatial-image) library to convert [OME-NGFF](https://ngff.openmicroscopy.org/) formatted data into `Xarray.DataTree`s of `Dataset`s
 - [Napari](https://napari.org/stable/) supports displaying Xarray. See [Example](https://napari.org/dev/gallery/xarray-latlon-timeseries.html)
+- [DeLTA](https://delta.readthedocs.io) is a research software using Deep
+Learning for the analysis (segmentation and tracking) of microscopy images of
+cells. It uses `xr.DataArray`s to store the image data, and `xr.Dataset`s to
+save the result of the analysis as netCDF4 files.