Add generators module

src/docgen/generators/__init__.py

@@ -0,0 +1,13 @@
+"""Generators package."""
+
+from docgen.generators.base import BaseGenerator
+from docgen.generators.html import HTMLGenerator
+from docgen.generators.markdown import MarkdownGenerator
+from docgen.generators.openapi import OpenAPIGenerator
+
+__all__ = [
+    "BaseGenerator",
+    "HTMLGenerator",
+    "MarkdownGenerator",
+    "OpenAPIGenerator",
+]