Update Readme

Author: DavidDevoogdt

README.md

@@ -2,3 +2,15 @@
 This git repo shows some of the work done for my master thesis at UGent quantum group http://mathphy.ugent.be/wp/quantum/
 
 unfinished report: https://github.com/DavidDevoogdt/Thesis_Tensor_Networks/blob/master/verslag/main.pdf
+
+
+How To use:
+
+start matlab in root folder of this repo, excute
+
+```
+doPath.m
+test 
+test_2D(struct('do_loops',1,'testing',1),1,'t_ising') 
+Ising2D_par(8, 2.5, 'g', struct('testing',1,'unit_cell',1,'par',0) , struct('order',5 ,'do_loops',1 ));
+```