Add file PyProject;

Support display of a single pubsub node item;
Update document README;
Modularize code;

pyproject.toml

@@ -0,0 +1,76 @@
+[build-system]
+requires = ["setuptools>=61.2"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "JabberCard"
+version = "0.1"
+description = "An HTML based invitation and service explorer for XMPP."
+authors = [{name = "Schimon Zachary", email = "sch@fedora.email"}]
+license = {text = "MIT"}
+classifiers = [
+    "Framework :: slixmpp",
+    "Intended Audience :: End Users/Desktop",
+    "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
+    "License :: OSI Approved :: MIT License",
+    "Natural Language :: English",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3.10",
+    "Topic :: Communications :: Chat",
+    "Topic :: Internet :: Extensible Messaging and Presence Protocol (XMPP)",
+    "Topic :: Internet :: WWW/HTTP :: Dynamic Content :: News/Diary",
+    "Topic :: Internet :: Instant Messaging",
+    "Topic :: Internet :: XMPP",
+    "Topic :: Office/Business :: News/Diary",
+]
+keywords = [
+    "atom",
+    "bot",
+    "chat",
+    "im",
+    "jabber",
+    "json",
+    "news",
+    "rdf",
+    "rss",
+    "syndication",
+    "xml",
+    "xmpp",
+]
+
+# urls = {Homepage = "https://gitgud.io/sjehuda/slixfeed"}
+
+dependencies = [
+    "fastapi",
+    "jinja2",
+    "lxml",
+    "numpy",
+    "opencv-python",
+    "python-dateutil",
+    "qrcode",
+    "slixmpp",
+    "tomli", # Python 3.10
+    "tomli_w",
+    "uvicorn",
+]
+
+[project.urls]
+Homepage = "https://schapps.woodpeckersnest.space/JabberCard"
+Repository = "https://git.xmpp-it.net/sch/JabberCard"
+Issues = "https://gitgud.io/sjehuda/JabberCard/issues"
+
+[project.optional-dependencies]
+omemo = ["slixmpp-omemo"]
+proxy = ["pysocks"]
+
+# [project.readme]
+# text = "Slixfeed is a news aggregator bot for online news feeds. This program is primarily designed for XMPP"
+
+[project.scripts]
+jabbercard = "jabbercard.__main__:main"
+
+[tool.setuptools]
+platforms = ["any"]
+
+[tool.setuptools.package-data]
+"*" = ["*.toml"]