New package: py-addict (#16535)

* [py-addict] created template

* [py-addict] added homepage and description

* [py-addict] cleaned up fixmes

* [py-addict] depends on py-setuptools

var/spack/repos/builtin/packages/py-addict/package.py

+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyAddict(PythonPackage):
+    """addict is a Python module that gives you dictionaries
+    whose values are both gettable and settable using
+    attributes, in addition to standard item-syntax."""
+
+    homepage = "https://github.com/mewwts/addict"
+    url      = "https://github.com/mewwts/addict/archive/v2.2.1.tar.gz"
+
+    version('2.2.1', sha256='398bba9e7fa25e2ce144c5c4b8ec6208e89b9445869403dfa88ab66ec110fa12')
+
+    depends_on('py-setuptools', type='build')