Store -> Datacube (#456)

Author: TomNicholas

README.md

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-## Cloud-Optimize your Scientific Data as Virtual Zarr stores, using xarray syntax.
+
+## Cloud-Optimize your Scientific Data as a Virtual Zarr Datacube, using Xarray syntax.
 
 The best way to distribute large scientific datasets is via the Cloud, in [Cloud-Optimized formats](https://guide.cloudnativegeo.org/) [^1]. But often this data is stuck in archival pre-Cloud file formats such as netCDF.
 
-**VirtualiZarr[^2] makes it easy to create "Virtual" Zarr stores, allowing performant access to archival data as if it were in the Cloud-Optimized [Zarr format](https://zarr.dev/), _without duplicating any data_.**
+**VirtualiZarr[^2] makes it easy to create "Virtual" Zarr datacubes, allowing performant access to archival data as if it were in the Cloud-Optimized [Zarr format](https://zarr.dev/), _without duplicating any data_.**
 
 Please see the [documentation](https://virtualizarr.readthedocs.io/en/stable/index.html).
 
 ### Features
 
-* Create virtual references pointing to bytes inside a archival file with [`open_virtual_dataset`](https://virtualizarr.readthedocs.io/en/latest/usage.html#opening-files-as-virtual-datasets),
-* Supports a [range of archival file formats](https://virtualizarr.readthedocs.io/en/latest/faq.html#how-do-virtualizarr-and-kerchunk-compare), including netCDF4 and HDF5,
-* [Combine data from multiple files](https://virtualizarr.readthedocs.io/en/latest/usage.html#combining-virtual-datasets) into one larger store using [xarray's combining functions](https://docs.xarray.dev/en/stable/user-guide/combining.html), such as [`xarray.concat`](https://docs.xarray.dev/en/stable/generated/xarray.concat.html),
+* Create virtual references pointing to bytes inside an archival file with [`open_virtual_dataset`](https://virtualizarr.readthedocs.io/en/latest/usage.html#opening-files-as-virtual-datasets).
+* Supports a [range of archival file formats](https://virtualizarr.readthedocs.io/en/latest/faq.html#how-do-virtualizarr-and-kerchunk-compare), including netCDF4 and HDF5, and has a pluggable system for supporting new formats.
+* [Combine data from multiple files](https://virtualizarr.readthedocs.io/en/latest/usage.html#combining-virtual-datasets) into one larger datacube using [xarray's combining functions](https://docs.xarray.dev/en/stable/user-guide/combining.html), such as [`xarray.concat`](https://docs.xarray.dev/en/stable/generated/xarray.concat.html).
 * Commit the virtual references to storage either using the [Kerchunk references](https://fsspec.github.io/kerchunk/spec.html) specification or the [Icechunk](https://icechunk.io/) transactional storage engine.
-* Users access the virtual dataset using [`xarray.open_dataset`](https://docs.xarray.dev/en/stable/generated/xarray.open_dataset.html#xarray.open_dataset).
+* Users access the virtual datacube simply as a single zarr-compatible store using [`xarray.open_zarr`](https://docs.xarray.dev/en/stable/generated/xarray.open_zarr.html).
 
 ### Inspired by Kerchunk