Merge branch '11-add-sonja-research-topics' into 'dev'

Resolve "add sonja research topics"

Closes #11

See merge request fabiangabel/research-topics-mat-tuhh!38

topics/Semi-open_queueing_networks_and_robotic_mobile_fulfillment_systems.md

@@ -14,10 +14,15 @@ We present a new solution approach. To approximate the inner network with the re
 
 We apply our results to robotic mobile fulfilment systems (RMFSs). Instead of sending pickers to the storage area to search for the ordered items and pick them, robots carry shelves with ordered items from the storage area to picking stations. We model the RMFS as an SOQN to determine the minimal number of robots.
 
-
-
-![Overview of the models](/img/Lost-customers-approximation-of-SOQN.jpg)
-
+<style>
+img {
+    max-width: 100%;
+    height: auto;      
+}
+</style>
+<div align="center">
+<img src="img/Lost-customers-approximation-of-SOQN.jpg" alt='Overview of the models'>
+</div>
 
 ## References