add purely synthetic folder

2024-pure-synthetic-data/README.md

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+This folder contains information and code related to the publication :
+
+"On the Effect of Purely Synthetic Training Data for Different Automatic Speech Recognition Architectures"
+
+
+The experiments of the paper were part of a master thesis from Benedikt Hilmes, for which the code can be found under:
+https://github.com/rwth-i6/i6_experiments/tree/main/users/hilmes/experiments/librispeech/nar_tts_2022
+
+Please note that most of the code was not specifially cleaned up, and may contain unrelated experiments. 
+For questions on how to run experiments and setup Sisyphus, please open an issue here or write to [rossenbach|hilmes]@cs.rwth-aachen.de.