Merge remote-tracking branch 'origin/master'

Author: moritzfl

README.md

@@ -4,6 +4,8 @@
 
 This software was developed with the aim to enrich teaching and learning in the area of algorithms with new possibilities. It is licensed under the terms of GPL v3.
 
+The project technically is my oldest project that is available to the public. It started as an university project during my bachelor studies (2015) and was since forked into teaching-algorithms, a project which is available [here](https://github.com/teaching-algorithms/teaching-algorithms/releases). I however decided to maintain sorting-algorithms as a separate project with the clear goal to cover sorting algorithms only. Updates to sorting-algorithms are not reflected in teaching-algorithms which hasn't received any updates since 2016.
+
 At this point I want to thank Dr. Klaus-J. Förster and René Goertz who allowed me to develop this as a university project and contributed to its success through feedback and proposals.
 
 Currently supported algorithms:
@@ -14,6 +16,7 @@ Currently supported algorithms:
 - Quicksort
 - Heapsort (Min-/Maxheap)
 - Insertionsort
+- Shellsort
 
 
 noteworthy features: