[Museformer]Update script for running inference directly.

[SkyMXF]

Hi, thanks for sharing your great work!
However, I was confused a lot when I just wanted to try Museformer with the inference step. It seems that the inference step only needs a "dict.txt" copied from data/meta/ to data-bin/lmd6remi/ rather than preparing the whole dataset. That is, the Dataset preparation and the training steps are unnecessary if someone just wants to try Musefomer, is it?
I add some init commands to the inference script. The readme is also updated about this. I think these could make the project clear to those who want to try Museformer.

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