Switch setup.py/.cfg to pyproject.toml, add docs link/readme

pyproject.toml

@@ -0,0 +1,46 @@
+[build-system]
+requires = ["setuptools>=42", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "FreeSimpleGUI"
+version = "5.2.0"
+description = "The free-forever Python GUI framework."
+readme = {file = "README.md", content-type = "text/markdown"}
+license = {file = "license.txt" }
+authors = [
+    {name = "Spencer Phillip Young", email = "spencer.young@spyoung.com"}
+]
+maintainers = [
+    {name = "Spencer Phillip Young", email = "spencer.young@spyoung.com"}
+]
+keywords = ["PySimpleGui", "fork", "GUI", "UI", "tkinter", "Qt", "WxPython", "Remi", "wrapper", "simple", "easy", "beginner", "novice", "student", "graphics", "progressbar", "progressmeter"]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
+    "Topic :: Multimedia :: Graphics",
+    "Operating System :: OS Independent",
+]
+
+[project.urls]
+# Homepage = "https://freesimplegui.org/" # TODO: Enable this once registered.
+Repository = "https://github.com/spyoungtech/FreeSimpleGui"
+Documentation = "https://freesimplegui.readthedocs.io/en/latest/"
+
+
+[tool.setuptools]
+packages = ["FreeSimpleGUI", "FreeSimpleGUI.elements"]
+include-package-data = true
+
+[project.scripts]
+fsgissue = "FreeSimpleGUI:main_open_github_issue"
+fsgmain = "FreeSimpleGUI:_main_entry_point"
+fsghelp = "FreeSimpleGUI:main_sdk_help"
+fsgver = "FreeSimpleGUI:main_get_debug_data"
+fsgsettings = "FreeSimpleGUI:main_global_pysimplegui_settings"