feature JabRef#6189 journal button

    - added initial python script to generate JSON from an API call
    - Is currently using Crossref API

scripts/journal-data-generator.py

@@ -0,0 +1,22 @@
+import urllib3
+import json 
+
+http = urllib3.PoolManager()
+
+crossref_base_url = 'https://api.crossref.org/journals'
+
+def crossref_with_ISSN(ISSN):
+    url = crossref_base_url + '/' + ISSN
+    print(url)
+    return http.request('GET', url)  
+
+# Test endpoint: https://api.crossref.org/journals/2158-5571 
+response = crossref_with_ISSN('2158-5571')
+print(response.status)
+# print(type(response.data))
+
+data = json.loads(response.data.decode('utf-8'))
+
+with open('data.json', 'w') as json_file:
+  json.dump(data, json_file)
+