Update todo.md

todo.md

 * Decide on citations - they code was developed for the sparse layered graph paper from Niels, cite is you use his implementation. Example applications
 * Make nice figure for qim webpage
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+* Reorganise notebooks (archive or move to parent folder), also the data
+* Describe tutorials content in readme (one is for learning the tool and the other two are LS integrated in a pipeline to solve users)
+* Reference user cases where LS was used
+* Figure in qim.dk
+* References in qim.dk
+* qim.dk/tutorials should reference these
 
 
 Anders' comments that we are going to solve