docs: add plotting_backends (#12)

Signed-off-by: Nathaniel Starkman <[email protected]>

profile/README.md

@@ -12,6 +12,7 @@
 - [`quaxed`](https://github.com/GalacticDynamics/quaxed/): Pre-[`quaxify`](https://docs.kidger.site/quax/)d libraries for use in multiple dispatch over abstract array types in `JAX`
 - [`dataclassish`](https://github.com/GalacticDynamics/dataclassish/): Tools from [`dataclasses`](https://docs.python.org/3/library/dataclasses.html), extended to all of Python
 - [`xmmutablemap`](https://github.com/GalacticDynamics/xmmutablemap): Immutable map (dict), compatible with `JAX`
+- [`plotting_backends`](https://github.com/GalacticDynamics/plotting_backends): Plotting dispatch backends.
 - [`optional_dependencies`](https://github.com/GalacticDynamics/optional_dependencies): Construct checks for optional dependencies
 - [`is_annotated`](https://pypi.org/project/is-annotated/): Check if an object is an `Annotated` type
 - [`zeroth`](https://github.com/GalacticDynamics/zeroth): Efficiently get the index-0 element of an iterable