Convert README to Markdown and mention ini2toml

Author: gvalkov

README.md

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+# setuptools-py2cfg
+
+<p>
+    <a href="https://pypi.python.org/pypi/setuptools-py2cfg"><img alt="pypi version" src="https://img.shields.io/pypi/v/setuptools-py2cfg.svg"></a>
+    <a href="https://github.com/gvalkov/setuptools-py2cfg/actions/workflows/tests.yml?query=branch:main"><img alt="Build status" src="https://img.shields.io/github/actions/workflow/status/gvalkov/setuptools-py2cfg/tests.yml?branch=main"></a>
+    <a href="https://github.com/gvalkov/setuptools-py2cfg/blob/main/LICENSE.txt"><img alt="License" src="https://img.shields.io/pypi/l/setuptools-py2cfg"></a>
+</p>
+
+
+Since version 30.3.0, [setuptools supports] declarative configuration through
+the `setup.cfg` file. This script helps convert existing `setup.py` files to
+`setup.cfg` in the format expected by setuptools.
+
+A `setup.cfg` file may be migrated to `pyproject.toml` with the help of
+[`ini2toml`](https://pypi.org/project/ini2toml) and
+[`validate-pyproject`](https://github.com/abravalheri/validate-pyproject).
+
+
+## Usage
+
+Just point `setuptools-py2cfg` to a `setup.py` file or run it in a directory
+containing `setup.py`. For example, given the following `setup.py`:
+
+``` python
+from setuptools import setup, find_packages
+
+classifiers = [
+    'Development Status :: 5 - Production/Stable',
+    'Programming Language :: Python :: 2.7',
+    'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.3',
+    'Programming Language :: Python :: 3.4',
+    'Programming Language :: Python :: 3.5',
+    'Programming Language :: Python :: 3.6',
+    'Intended Audience :: Developers',
+    'Topic :: Software Development :: Libraries',
+    'License :: OSI Approved :: BSD License',
+]
+
+extras_require = {
+    'tests': [
+        'tox >= 2.6.0',
+        'pytest >= 3.0.3',
+    ],
+    'devel': [
+        'check-manifest >= 0.35',
+        'readme-renderer >= 16.0',
+    ]
+}
+
+kw = {
+    'name':                 'ansimarkup',
+    'version':              '1.3.0',
+
+    'description':          'Produce colored terminal text with an xml-like markup',
+    'long_description':     open('README.rst').read(),
+
+    'author':               'Georgi Valkov',
+    'author_email':         '[email protected]',
+    'license':              'Revised BSD License',
+    'keywords':             'ansi terminal markup',
+    'url':                  'https://github.com/gvalkov/python-ansimarkup',
+    'classifiers':          classifiers,
+    'install_requires':     'colorama',
+    'extras_require':       extras_require,
+    'packages':             find_packages(),
+    'zip_safe':             True,
+}
+
+if __name__ == '__main__':
+    setup(**kw)
+```
+
+Running `setuptools-py2cfg.py` would print:
+
+``` ini
+[metadata]
+name = ansimarkup
+version = 1.3.0
+author = Georgi Valkov
+author_email = [email protected]
+license = Revised BSD License
+description = Produce colored terminal text with an xml-like markup
+keywords = ansi, terminal, markup
+url = https://github.com/gvalkov/python-ansimarkup
+long_description = file: README.rst
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Programming Language :: Python :: 2.7
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.3
+    Programming Language :: Python :: 3.4
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Intended Audience :: Developers
+    Topic :: Software Development :: Libraries
+    License :: OSI Approved :: BSD License
+
+[options]
+packages = find:
+zip_safe = True
+install_requires = colorama
+
+[options.extras_require]
+tests =
+    tox >= 2.6.0
+    pytest >= 3.0.3
+devel =
+    check-manifest >= 0.35
+    readme-renderer >= 16.0
+```
+
+There are several non-essential options that control the format of the
+generated ini-file:
+
+    usage: setuptools-py2cfg.py [-h] [-t int] [-i int] [-a] [path]
+
+    converts an existing setup.py file to a setup.cfg in the format expected by
+    setuptools
+
+    positional arguments:
+      path                  path to setup.py file (default: ./setup.py)
+
+    optional arguments:
+      -h, --help            show this help message and exit
+      -t int, --dangling-list-threshold int
+                            lists longer than this many characters are converted
+                            to a dangling list (default: 40)
+      -i int, --dangling-list-indent int
+                            number of spaces to use when indenting dangling lists
+                            (default: 4)
+      -a, --always-use-dangling-lists
+                            use dangling lists everywhere (default: False)
+
+Keep in mind that a `setup.py` file with a single call to `setuptools.setup()`
+is still needed after migrating all metadata to `setup.cfg`.
+
+## Installation
+
+The latest stable version of setuptools-py2cfg can be installed from
+pypi:
+
+``` bash
+$ pip install setuptools-py2cfg
+```
+
+## Todo
+
+-   Handle `entry_scripts` in ini-format.
+-   Write a test or two.
+
+## License
+
+Released under the terms of the [Revised BSD License].
+
+  [setuptools supports]: https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html
+  [Revised BSD License]: https://raw.github.com/gvalkov/setuptools-py2cfg/master/LICENSE