Add file PyProject;

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

jabbercard/utilities/toml.py

@@ -0,0 +1,30 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+import tomli_w
+import xml.etree.ElementTree as ET
+
+try:
+    import tomllib
+except:
+    import tomli as tomllib
+
+class Toml:
+
+    def open_file_toml(filename: str) -> dict:
+        with open(filename, mode="rb") as fn:
+            data = tomllib.load(fn)
+            return data
+
+    def save_to_toml(filename: str, data: dict) -> None:
+        with open(filename, 'w') as fn:
+            data_as_string = tomli_w.dumps(data)
+            fn.write(data_as_string)
+
+    def open_file_xml(filename: str) -> ET.ElementTree:
+        data = ET.parse(filename)
+        return data
+
+    def save_to_file(filename: str, data: str) -> None:
+        with open(filename, 'w') as fn:
+            fn.write(data)