Add release notes for v0.0.22

Author: mhostetter

docs/release-notes/v0.0.md

@@ -4,6 +4,25 @@ tocdepth: 2
 
 # v0.0
 
+## v0.0.22
+
+*Released July 13, 2024*
+
+### Changes
+
+- Added support for NumPy v2.
+- Increased required `galois` version to `v0.4.1`.
+- Added calculation of instantaneous power in `sdr.power()`.
+- Refactored `sdr.binary_code()` and `sdr.gray_code()` to accept `length`, not `degree`.
+- Reworked argument verification of entire public API.
+- Improved nuisance warning suppression.
+- Improved documentation.
+- Fixed minor bugs.
+
+### Contributors
+
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
 ## v0.0.21
 
 *Released June 15, 2024*