Add release notes for v0.0.23

Author: mhostetter

docs/release-notes/v0.0.md

@@ -4,6 +4,29 @@ tocdepth: 2
 
 # v0.0
 
+## v0.0.23
+
+*Released July 28, 2024*
+
+### Changes
+
+- Added calculation of filter noise bandwidth in `sdr.FIR.noise_bandwidth()` and `sdr.IIR.noise_bandwidth()`.
+- Added calculation of threshold level above the noise power in `sdr.threshold_factor()`.
+- Added numerical calculation of the PDF of the sum and product of random variables in `sdr.sum_distribution()`,
+  `sdr.sum_distributions()`, and `sdr.multiply_distributions()`.
+- Renamed `sdr.design_frac_delay_fir()` to `sdr.fractional_delay_fir()`.
+- Renamed `sdr.design_lowpass_fir()` to `sdr.lowpass_fir()`.
+- Renamed `sdr.design_highpass_fir()` to `sdr.highpass_fir()`.
+- Renamed `sdr.design_bandpass_fir()` to `sdr.bandpass_fir()`.
+- Renamed `sdr.design_bandstop_fir()` to `sdr.bandstop_fir()`.
+- Renamed `sdr.design_multirate_fir()` to `sdr.multirate_fir()`.
+- Allowed use of SciPy window definition using `scipy.signal.windows.get_window()` for all filter design and plotting
+  functions.
+
+### Contributors
+
+- Matt Hostetter ([@mhostetter](https://github.com/mhostetter))
+
 ## v0.0.22
 
 *Released July 13, 2024*