feat: web design rules jonasschmedtmann#3: images and illustrations

Author: Uribouz

starter/05-Design/UsefulLinks.txt

@@ -13,4 +13,13 @@ Color toolbox
     palleton.com
     coolors
         https://coolors.co/contrast-checker/112a46-acc8e5
-    Tint & Shade Generator
+    Tint & Shade Generator
+ 
+Images toolbox
+    Unsplash (Free Images)
+    Pexels (Free Images)
+    DrawKit (Free Images)
+    unDraw (Free Images)
+    Squoosh (Compress Images)
+
+