Add to Readme example

Author: jhthompson

README.md

@@ -17,7 +17,7 @@ INSTALLED_APPS = [
 ]
 ```
 
-3. Use the template tag
+3. Use the bootstrap_email template tag in your Django template
 
 ```html
 {% load bootstrap_email %}
@@ -28,7 +28,7 @@ INSTALLED_APPS = [
     <div class="card my-10">
       <div class="card-body">
           <p>
-            Hello World!
+            {{ message }}
           </p>
       </div>
     </div>
@@ -37,6 +37,28 @@ INSTALLED_APPS = [
 {% end_bootstrap_email %}
 ```
 
+4. Create the email and send it
+
+```python
+context = {
+    "message": "Hello World!",
+}
+
+subject = "Greeting"
+# you should always include a plain text version of the HTML email
+text_content = render_to_string("path/to/template.txt", context)
+html_content = render_to_string("path/to/template.html", context)
+
+email_message = EmailMultiAlternatives(
+    subject=subject,
+    body=text_content,
+    from_email="[email protected]",
+    to=["[email protected]"],
+)
+email_message.attach_alternative(html_content, "text/html")
+email_message.send()
+```
+
 And a complete HTML email will be output, which should render correctly across email clients:
 
 ![Rendered HTML email example](https://raw.githubusercontent.com/jhthompson/django-bootstrap-email/main/example.png)