added mkdoc extension for snippets

Author: amirreza8002

mkdocs.yml

@@ -1,5 +1,11 @@
 site_name: django async extensions
 repo_url: https://github.com/amirreza8002/django-async-extensions
+
+markdown_extensions:
+  - pymdownx.snippets:
+      check_paths: true
+      base_path: ["."]
+
 theme:
   name: material
   highlightjs: true
@@ -29,3 +35,4 @@ theme:
         icon: material/weather-night
         name: Switch to system preference
 
+