Add instructions for dataset preparation

scripts/README.md

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+# How to prepare dataset for training
+
+1. Download Ukrainian dataset from [https://github.com/egorsmkv/speech-recognition-uk](https://github.com/egorsmkv/speech-recognition-uk).
+2. Delete Common Voice folder in dataset
+3. Download [import_ukrainian.py](scripts/import_ukrainian.py) and put into DeepSpeech/bin folder.
+4. Run import script
+5. Download Common Voice 6.1 Ukrainian dataset
+6. Convert to DeepSpeech format
+7. Merge train.csv from dataset and from DeepSpeech into one file
+8. Put CV files into dataset files folder
+9. Put dev.csv and test.csv into folder
+
+You have a reproducible dataset!