python3Packages.hjson: init at 3.0.2

This library provides a human readable extension to JSON and is used as a
dependency in packages like [qmk](https://github.com/qmk/qmk_cli)

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/top-level/python-packages.nix

@@ -2757,6 +2757,8 @@ in {
 
   hiyapyco = callPackage ../development/python-modules/hiyapyco { };
 
+  hjson = callPackage ../development/python-modules/hjson { };
+
   hkdf = callPackage ../development/python-modules/hkdf { };
 
   hmmlearn = callPackage ../development/python-modules/hmmlearn { };