ci: add pyproject classifiers and urls

pyproject.toml

@@ -12,6 +12,35 @@ dependencies = [
 requires-python = ">=3.8"
 readme = "README.md"
 license = {text = "MIT"}
+classifiers = [
+  "Development Status :: 3 - Alpha",
+  "Environment :: Web Environment",
+  "License :: OSI Approved :: MIT License",
+  "Natural Language :: English",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python",
+  "Topic :: Internet :: WWW/HTTP",
+  "Topic :: Software Development :: Libraries",
+  "Topic :: Software Development",
+  "Typing :: Typed",
+  "Intended Audience :: Developers",
+  "Intended Audience :: Information Technology",
+  "Intended Audience :: System Administrators",
+  "Topic :: Internet",
+  "Topic :: Internet :: WWW/HTTP :: HTTP Servers",
+  "Topic :: Software Development :: Libraries :: Application Frameworks",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+]
+
+[project.urls]
+Documentation = "https://flaskwebsockets.readthedocs.io/en/latest/"
+"Issue Tracker" = "https://github.com/ch-iv/flask-websockets/issues"
+Repository = "https://github.com/ch-iv/flask-websockets"
 
 [build-system]
 requires = ["pdm-backend"]