Merge pull request #206 from nspcc-dev/168-new-upload-download

Add new upload and edit download requests

CHANGELOG.md

@@ -13,6 +13,16 @@ the help of the [gate-configuration.md](./docs/gate-configuration.md) and
 [config](./config/config.yaml). Also, flags in the command arguments were 
 changed.
 
+A new upload object request has been introduced: `/objects/{containerId}`. This
+is a POST request that accepts the `X-Attributes` header, where all custom
+object attributes can be included in a JSON-formatted key-value map. Also, new 
+GET and HEAD requests are added for object downloading:
+`/objects/{containerId}/by_id/{objectId}` and 
+`/objects/{containerId}/by_attribute/{attrKey}/{attrVal}`.
+For more information, see the [migration documentation](./docs/migration-new-upload.md).
+In the future, we plan to use these requests as the only option for object
+upload and download. We recommend starting to use them now.
+
 ## [0.8.3] - 2024-03-25
 
 ### Fixed