Added comments to Parser.py

Backend-libXML/Parser.py

@@ -2,10 +2,20 @@ from lxml import etree
 
 
 def prettify(source: str) -> str:
+    """Method used to pretty format given XML
+
+    :param source: XML
+    :return: prettified XML
+    """
     xml = etree.XML(source)
     return etree.tostring(xml, pretty_print=True).decode()
 
 def minimize(source: str) -> str:
+    """Method used to minimize XML by deleting not needed whitespaces.
+
+    :param source: XML
+    :return: minimized XML
+    """
     result = source
     
     to_remove = ["   ", "  ", "\t", "\n"]