Add long description to setup.py (#1094)

Summary:
Fixes #1088

### Changes

- Added the README.md as a long description in the `setup.py`
- Added `long_description_content_type` field

Co-Authored by:
Martin Achtner <martin.achtner@tngtech.com>
Jad Saliba <jad.saliba@tngtech.com>

Pull Request resolved: #1094

Reviewed By: NivekT

Differential Revision: D44166989

Pulled By: ejguan

fbshipit-source-id: 24fafc170a825372356aba8c3f086a360902b6c9

setup.py

@@ -161,6 +161,8 @@ def remove_extension(pattern):
         name="torchdata",
         version=VERSION,
         description="Composable data loading modules for PyTorch",
+        long_description=Path("README.md").read_text(encoding="utf-8"),
+        long_description_content_type="text/markdown",
         url="https://github.com/pytorch/data",
         author="PyTorch Team",
         author_email="packages@pytorch.org",
@@ -176,6 +178,7 @@ def remove_extension(pattern):
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
+            "Programming Language :: Python :: 3.11",
             "Programming Language :: Python :: Implementation :: CPython",
             "Topic :: Scientific/Engineering :: Artificial Intelligence",
         ],