categories - add SDR category

Author: elpiel

src/boot/categories.toml

@@ -500,6 +500,14 @@ Crates used to model or construct models for some activity, e.g. to.\
 simulate a networking protocol.\
 """
 
+[software-defined-radio]
+name = "Software-defined radio"
+description = """
+Crates related to Software-defined radio where components that have been \
+traditionally implemented in hardware are instead implemented \
+by means of software.\
+"""
+
 [template-engine]
 name = "Template engine"
 description = """