Update README.md

Author: ahmedfgad

README.md

@@ -113,7 +113,7 @@ The `previous_layer` attribute in the `nn.DenseLayer` class creates a linked lis
 
 The last (output) layer indexed N points to layer **N-1**, layer **N-1** points to the layer **N-2**, the layer **N-2** points to the layer **N-3**, and so on until reaching the end of the linked list which is layer 1 (input layer).
 
-![Layers Linked List](Layers Linked List.jpg)
+![Layers Linked List](https://user-images.githubusercontent.com/16560492/81918975-816af880-95d7-11ea-83e3-34d14c3316db.jpg)
 
 The linked list allows returning all properties of all layers in the network architecture by just passing the last layer in the network. Using the `previous_layer` attribute of layer **N**, the layer **N-1** can be accessed. Using the `previous_layer` attribute of layer **N-1**, layer **N-2** can be accessed. The process continues until reaching a layer that does not have a `previous_layer` attribute (which is the input layer).