Create add_context_processor.md

django/add_context_processor.md

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+# Adding a custom context processor to your Django app so you can include bits of data in your template headers more easily 
+
+## 1. Add `my_app/context_processors.py` 
+
+```python
+from __future__ import annotations
+
+
+def my_context(request):
+    """
+    Adds a special notice for a sale 
+    """
+    return {"notice": "All cat toys 50% off!"} 
+
+```
+
+
+## 2. Add to settings 
+
+In `settings.py`:
+
+```python
+TEMPLATES = [
+    {
+        ...
+        "OPTIONS": {
+            "context_processors": [
+                ...
+                "my_app.context_processors.my_context",
+            ],
+        },
+    }
+]
+```
+
+## 3. Use your context value in your template: 
+
+```html
+<h2>{{ notice }}</h2>
+```