Added NMF example patches to Toolkit patch (#390)

* NMF examples tidied

* tidied piano classifier example

* Created a header file to link to all the nmf patches

* nmf example now links to the nmf header file

* fully commented jit-nmf

* Piano classifier fully commented

* nmf2filter fully commented

* Header File now contains correct descriptions

* final tidying of example patches

* fixed bug with dict names

* Toolkit Link and description implemented

* Grammar corrections to header file

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Co-authored-by: tremblap <[email protected]>