Add documentation for compression.zstd

Author: emmatyping

Doc/library/archiving.rst

@@ -5,13 +5,15 @@ Data Compression and Archiving
 ******************************
 
 The modules described in this chapter support data compression with the zlib,
-gzip, bzip2 and lzma algorithms, and the creation of ZIP- and tar-format
+gzip, bzip2, zstd, and lzma algorithms, and the creation of ZIP- and tar-format
 archives.  See also :ref:`archiving-operations` provided by the :mod:`shutil`
 module.
 
 
 .. toctree::
 
+   compression.rst
+   compression.zstd.rst
    zlib.rst
    gzip.rst
    bz2.rst

Doc/library/compression.rst

@@ -0,0 +1,25 @@
+The :mod:`!compression` package
+=================================
+
+.. versionadded:: 3.14
+
+.. note::
+
+    Several modules in :mod:`!compression` re-export modules that currently
+    exist at the repository top-level. These re-exported modules are the new
+    canonical import name for the respective top-level module. The existing
+    modules are not currently deprecated and will not be removed prior to Python
+    3.19, but users are encouraged to migrate to the new import names when
+    feasible.
+
+* :mod:`!compression.bz2` -- Re-exports :mod:`bz2`
+
+* :mod:`!compression.gzip` -- Re-exports :mod:`gzip`
+
+* :mod:`!compression.lzma` -- Re-exports :mod:`lzma`
+
+* :mod:`!compression.zlib` -- Re-exports :mod:`zlib`
+
+* :mod:`compression.zstd` -- Wrapper for the Zstandard compression library
+
+