Update README.md

Author: thiagodnf

README.md

@@ -30,6 +30,26 @@ A comprehensive collection of Gnuplot examples
     </kbd>
 </div>
 
+#### Bubble Chart
+
+<div >
+    <kbd>
+        <a href="https://github.com/iselab-dearborn/gnuplot-scripts/tree/main/scatter-and-bubble-charts/scatter-plot">
+            <img src="https://user-images.githubusercontent.com/114015/102026526-5f537780-3d6c-11eb-9250-043e3c149dce.png"/>
+        </a>
+    </kbd>
+</div>
+
+#### Bubble Chart 3D
+
+<div >
+    <kbd>
+        <a href="https://github.com/iselab-dearborn/gnuplot-scripts/tree/main/scatter-and-bubble-charts/scatter-plot">
+            <img src="https://user-images.githubusercontent.com/114015/102026524-5ebae100-3d6c-11eb-87d8-014c4054c5d5.png"/>
+        </a>
+    </kbd>
+</div>
+
 ### Column and Bar Charts
 
 #### Basic Bar