provide django version check guidance (mongodb#245)

Author: Jibola

README.md

@@ -26,8 +26,14 @@ $ pip install --pre django-mongodb-backend==5.0.*
 
 From your shell, run the following command to create a new Django project
 called `example` using our custom template. Make sure the zipfile referenced
-at the end of the template link corresponds to your
-version of Django. The snippet below specifies `5.0.x.zip` at the end of
+at the end of the template link corresponds to your version of Django.
+
+You can check what version of Django you're using with:
+```bash
+$ django-admin --version
+```
+
+The snippet below specifies `5.0.x.zip` at the end of
 the template url to get the template for any Django version matching 5.0:
 
 ```bash