add .zenodo.json file and validator for CITATION.cff

.zenodo.json

@@ -0,0 +1,36 @@
+{
+  "creators": [
+    {
+      "name": "Rüßmann, Philipp",
+      "orcid": "0000-0002-6196-2700"
+    },
+    {
+      "name": "Bertoldo, Fabian"
+    },
+    {
+      "name": "Bröder, Jens",
+      "orcid": "0000-0001-7939-226X"
+    },
+    {
+      "name": "Wasmer, Johannes",
+      "orcid": "0000-0001-5113-3119"
+    },
+    {
+      "name": "Mozumder, Rubel"
+    },
+    {
+      "name": "Chico, Jonathan",
+      "orcid": "0000-0001-5034-159X"
+    },
+    {
+      "name": "Blügel, Stefan",
+      "orcid": "0000-0001-9987-4733"
+    }
+  ],
+  "license": {
+    "id": "MIT"
+  },
+  "publication_date": "2024-12-05",
+  "title": "AiiDA-KKR",
+  "version": "2.3.1"
+}

CITATION.cff

@@ -28,7 +28,7 @@ authors:
 url: 'https://github.com/JuDFTteam/aiida-kkr'
 license: MIT
 version: 2.3.1
-date-released: '2020-01-27'
+date-released: '2024-12-05'
 doi: 10.5281/zenodo.3628250
 preferred-citation:
   type: article