cite: Add Zenodo metadata

This commit provides more hints that may help to use this module
properly.

Signed-off-by: Johannes Demel <[email protected]>

Author: jdemel

.zenodo.json

@@ -43,6 +43,18 @@
             "identifier": "https://pubs.gnuradio.org/index.php/grcon/article/view/23/17",
             "relation": "isDocumentedBy",
             "resource_type": "publication-conferencepaper"
+        },
+        {
+            "scheme": "doi",
+            "identifier": "10.5281/zenodo.6514722",
+            "relation": "isSupplementedBy",
+            "resource_type": "software"
+        },
+        {
+            "scheme": "doi",
+            "identifier": "10.5281/zenodo.2704343",
+            "relation": "requires",
+            "resource_type": "software"
         }
     ],
     "creators": [