Add trove classifiers

Author: mitya57

pyproject.toml

@@ -11,6 +11,15 @@ authors = [{ name = "Dmitry Shachnev", email = "[email protected]" }]
 license = "BSD-3-Clause"
 requires-python = ">=3.9"
 dependencies = ["Markdown>=3.0"]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Topic :: Scientific/Engineering :: Mathematics",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+  "Topic :: Text Processing :: Markup :: Markdown",
+]
 
 [project.entry-points."markdown.extensions"]
 mdx_math = "mdx_math:MathExtension"