Add pypi classifiers to pyproject.toml (#4383)

* Add pypi classifiers to pyproject.toml

* Add OS classifier

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Co-authored-by: Freddy Boulton <alfonsoboulton@gmail.com>

pyproject.toml

@@ -19,6 +19,22 @@ authors = [
 ]
 keywords = ["machine learning", "reproducibility", "visualization"]
 
+classifiers = [
+  'Development Status :: 5 - Production/Stable',
+  'License :: OSI Approved :: Apache Software License',
+  'Operating System :: OS Independent',
+  'Programming Language :: Python :: 3',
+  'Programming Language :: Python :: 3 :: Only',
+  'Programming Language :: Python :: 3.7',
+  'Programming Language :: Python :: 3.8',
+  'Programming Language :: Python :: 3.9',
+  'Programming Language :: Python :: 3.10',
+  'Programming Language :: Python :: 3.11',
+  'Topic :: Scientific/Engineering',
+  'Topic :: Scientific/Engineering :: Artificial Intelligence',
+  'Topic :: Scientific/Engineering :: Visualization',
+]
+
 [project.scripts]
 gradio = "gradio.cli:cli"
 upload_theme = "gradio.themes.upload_theme:main"