Update README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

README.md

@@ -241,6 +241,10 @@ This pages are in a rough state. e.g. equations are broken. Don't know why...
   - [Quadratic Integrate-and-Fire](advanced_programming/quadratic_integrate_and_fire/README.md)
   - [Connor Stevens](advanced_programming/connor_stevens/README.md)
 * [References](advanced_programming/references/README.md)
+* Task 2 -- Pictures for comparision
+  - [Mandatory Tasks](advanced_programming/task_2_result_pictures/README.md)
+  - [Voluntary Tasks: Preprocessing](advanced_programming/task_2_result_pictures_preprocessing/README.md)
+  - [Voluntary Tasks: More Information!](advanced_programming/task_2_result_pictures_information/README.md)
 
 ## Advanced Studies
 * Material from ages past