Update README.md

README.md

@@ -20,7 +20,8 @@ Designed for both **technical and non-technical learners**, these notebooks focu
 ## Current Notebooks
 - **Notebook 1** → Images as arrays with **NumPy** (understanding pixels).  
 - **Notebook 2** → Working with real images (loading, resizing, color channels).  
-- **Notebook 3** → Basic image transformations and manipulations.  
+- **Notebook 3** → Basic image transformations and manipulations.
+- **Notebook 4** → Shapes and text on image (understanding bounding box)
 
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