Add citation

Author: johmedr

CITATION.cff

@@ -7,8 +7,7 @@ authors:
 - given-names: 'Johan'
   family-names: 'Medrano'
   orcid: 'https://orcid.org/0000-0002-7558-2071'
-repository-code: 'https://github.com/fooof-tools/fooof_mat'
-url: 'https://fooof-tools.github.io/'
+repository-code: 'https://github.com/johmedr/radsel'
 license: MIT
 preferred-citation:
   type: article