docs: add is_annotated (#6)

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`
+- [`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.
 
 
@@ -22,6 +23,6 @@ Let us know if you're building in the `GalacticDynamics` ecosystem!
 
 ### Broader Galactic Dynamics Ecosystem
 
-- [`gala`](https://github.com/adrn/gala/): Galactic and Gravitational Dynamics in `Python`
+- [`gala`](https://github.com/adrn/gala/): Galactic and Gravitational Dynamics in Python
 - [`galpy`](https://docs.galpy.org/en/latest/index.html): Python package for galactic dynamics
 - [`agama`](https://github.com/GalacticDynamics-Oxford/Agama): Action-based galaxy modeling framework