add pyproject metadata

pyproject.toml

@@ -0,0 +1,40 @@
+[build-system]
+requires = ["setuptools", "setuptools_scm"]
+build-backend = "setuptools.build_meta"
+
+
+[project]
+authors  = [
+    {name = "Will Fatherley", email = "[email protected]"}
+]
+classifiers = [
+    "Intended Audience :: Developers",
+    "Topic :: Security :: Cryptography",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3"
+]
+description = "HMAC-base key derivation function (IETF RFC 5869) implemented with Python"
+dynamic = [
+    "version"
+]
+license = {file = "LICENSE.md"}
+maintainers = [
+    {name = "Will Fatherley", email = "[email protected]"}
+]
+name = "hkdfref"
+readme = {file = "README.md", content-type = "text/markdown"}
+
+
+[project.urls]
+repository = "https://github.com/wfatherley/hkdfref.git"
+
+
+# [project.scripts]
+# hkdf = hkdfref:cli
+
+
+[tool.setuptools.packages.find]
+where = ["src"]
+include = ["hkdfref"]
+
+[tool.setuptools_scm]