add a configurable list of recipients/cert dict

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}