added text types

src/textnode.py

@@ -1,3 +1,10 @@
+text_type_text = "text"
+text_type_bold = "bold"
+text_type_italic = "italic"
+text_type_code = "code"
+text_type_link = "link"
+text_type_image = "image"
+
 class TextNode:
     def __init__(self, text, text_type, url=None) -> None:
         self.text = text