Add "Created" as additional (optional) parameter for post_documents (#965)

* Added "created" as optional parameter for post_documents.

* Fixed Conflict

* After Black Reformatting

* Run "add-trailing-comma"

* The right order between black and trailing comma is important....

* Added required=False

* Adds unit test for optional created in document api POST

* Fixes adding of settings override

* And a mis-added print, sigh

Co-authored-by: Philipp <philipp@invalid.invalid>
Co-authored-by: Trenton Holmes <holmes.trenton@gmail.com>

src/documents/serialisers.py

@@ -412,6 +412,13 @@ class BulkEditSerializer(DocumentListSerializer):
 
 class PostDocumentSerializer(serializers.Serializer):
 
+    created = serializers.DateTimeField(
+        label="Created",
+        allow_null=True,
+        write_only=True,
+        required=False,
+    )
+
     document = serializers.FileField(
         label="Document",
         write_only=True,