Add Usage section with examples to README.md (#10)

Co-authored-by: GitHub Action (aider) <[email protected]>

plain-sessions/plain/sessions/README.md

@@ -4,3 +4,17 @@ Manage sessions and save them in the database.
 
 - associate with users?
 - devices?
+
+## Usage
+
+To use sessions in your views, access the `request.session` object:
+
+```python
+# Example view using sessions
+class MyView(View):
+    def get(self):
+        # Store a value in the session
+        self.request.session['key'] = 'value'
+        # Retrieve a value from the session
+        value = self.request.session.get('key')
+```