Add setup.{py,cfg} and LICENSE.

Closes #9.
Closes #6.

LICENSE

@@ -0,0 +1,13 @@
+Copyright (c) 2020 demes developers.
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

setup.cfg

@@ -0,0 +1,29 @@
+[metadata]
+name = demes
+author = demes developers
+license = ISC
+description = tools for describing demographic models
+url = https://github.com/grahamgower/demes
+classifiers =
+    Development Status :: 1 - Planning
+    License :: OSI Approved :: ISC License (ISCL)
+    Operating System :: OS Independent
+    Intended Audience :: Science/Research
+    Programming Language :: Python :: 3
+    Topic :: Scientific/Engineering
+
+[options]
+packages = demes
+zip_safe = False  # https://mypy.readthedocs.io/en/latest/installed_packages.html
+include_package_data = True
+python_requires = >=3.6
+install_requires =
+    attrs >= 19.1.0
+    strictyaml
+    setuptools >= 41.2  # For pkg_resources
+setup_requires =
+    setuptools >= 41.2
+    setuptools_scm
+
+[mypy-strictyaml.*]
+ignore_missing_imports = True

setup.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python3
+from setuptools import setup
+
+setup(use_scm_version=True)