add description attribute to formatting config

PyTeX/format/formatting_config.py

@@ -9,6 +9,7 @@ class FormattingConfig(Config):
     def __init__(self):
         self._naming_scheme: Optional[Union[NamingScheme, str]] = None
         self._license: Optional[List[License]] = None
+        self._description: Optional[str] = None
 
         self._include_extra_header: Optional[bool] = None
         self._include_build_time: Optional[bool] = None
@@ -195,6 +196,13 @@ class FormattingConfig(Config):
         else:
             return self._escape_character
 
+    @property
+    def description(self) -> str:
+        if self._description is None:
+            return ''
+        else:
+            return self._description
+
 
 class DocFormattingConfig:
     def __init__(self):

PyTeX/format/pytex_formatter.py

@@ -116,7 +116,11 @@ class PyTeXFormatter(FormatterIF):
 
         return self._header
 
-    def format_header(self, **kwargs) -> None:
-        self._header = self.header.format(
-            **kwargs
-        )  # TODO: add standard keywords here
+    def format_header(self, **kwargs) -> str:
+        return '\n'.join(
+            [
+                '%'*80,
+                self.header.format(**kwargs), # TODO: add standard keywords here
+                '%'*80
+            ]
+        )