move diffpy files to src dir

pyproject.toml

@@ -7,6 +7,7 @@ name = "diffpy.srmise"
 dynamic=['version']
 authors = [
   { name="Simon J.L. Billinge group", email="[email protected]" },
+        {name="Luke Granlund", email="[email protected]"},
 ]
 maintainers = [
   { name="Simon J.L. Billinge group", email="[email protected]" },

src/diffpy/__init__.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+##############################################################################
+#
+# (c) 2024 The Trustees of Columbia University in the City of New York.
+# All rights reserved.
+#
+# File coded by: Billinge Group members and community contributors.
+#
+# See GitHub contributions for a more detailed list of contributors.
+# https://github.com/diffpy/diffpy.srmise/graphs/contributors
+#
+# See LICENSE.rst for license information.
+#
+##############################################################################
+
+"""Blank namespace package for module diffpy."""
+
+
+from pkgutil import extend_path
+
+__path__ = extend_path(__path__, __name__)
+
+# End of file

src/diffpy/srmise/__init__.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+##############################################################################
+#
+# (c) 2024 The Trustees of Columbia University in the City of New York.
+# All rights reserved.
+#
+# File coded by: Billinge Group members and community contributors.
+#
+# See GitHub contributions for a more detailed list of contributors.
+# https://github.com/diffpy/diffpy.srmise/graphs/contributors
+#
+# See LICENSE.rst for license information.
+#
+##############################################################################
+
+"""Peak extraction and peak fitting tool for atomic pair distribution functions."""
+
+# package version
+from diffpy.srmise.version import __version__
+
+# silence the pyflakes syntax checker
+assert __version__ or True
+
+# End of file