add use cases and update README

README.md

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 Repository containing standards developed at the DCML
 
 This repository contains the standard for harmonic annotations developed at the [Digital and Cognitive Musicology Lab](https://dcml.epfl.ch/) at [École Polytechnique Fédérale de Lausanne](https://www.epfl.ch/).
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+## Use cases
+
+The annotation standard was used in
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+1. Moss FC, Neuwirth M, Harasim D, Rohrmeier M (2019) Statistical characteristics of tonal harmony: A corpus study of Beethoven’s string quartets. PLoS ONE 14(6): e0217242. [https://doi.org/10.1371/journal.pone.0217242](https://doi.org/10.1371/journal.pone.0217242)
+2. Neuwirth M, Harasim D, Moss FC and Rohrmeier M (2018) The Annotated Beethoven Corpus (ABC): A Dataset of Harmonic Analyses of All Beethoven String Quartets. Front. Digit. Humanit. 5:16. doi: [https://doi.org/10.3389/fdigh.2018.00016](https://doi.org/10.3389/fdigh.2018.00016)
+
+## Log
+
+### v1.0.0
+* Initial version of the regular expression to annotate harmonies
+* Taken from: https://github.com/DCMLab/ABC