Add License and OS info in pyproject.toml.

PyPI extracts the License and OS info from pyproject.toml classifiers. 


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pyproject.toml

@@ -23,6 +23,8 @@ classifiers = [
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
+  "License :: OSI Approved :: MIT License",
+  "Operating System :: OS Independent",
 ]
 dependencies = []