chore: add package metadata

pyproject.toml

@@ -1,9 +1,29 @@
 [tool.poetry]
 name = "flake8-too-many"
 version = "0.1.0-alpha.0"
+
 description = "A flake8 plugin that prevents you from writing \"too many\" bad codes."
+readme = "README.md"
+license = "MIT"
+
 authors = ["Queensferry <[email protected]>"]
 
+repository = "https://github.com/queensferryme/flake8-too-many"
+homepage = "https://github.com/queensferryme/flake8-too-many"
+keywords = ["code quality", "flake8", "linting", "plugin"]
+
+classifiers = [
+    "Environment :: Console",
+    "Framework :: Flake8",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: Quality Assurance",
+]
+
 [tool.poetry.dependencies]
 python = "^3.6.1"
 dataclasses = {version = "^0.8", python = "< 3.7"}