compile/use instructions without snap

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Instructions for use without snap.

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If I have noting else to do I might add a PyPi package...

Otherwise: Clone repository or download zip and unzip to any location on your hdd

Follow https://ocrmypdf.readthedocs.io/en/latest/installation.html to install ocrmypdf, tesseract (+language packs) and jbig2enc

sudo apt install tesseract-ocr-all
pip install pdftotext ocrmypdf pikepdf pyzbar darkdetect rich

Enter code directory

python ./OCRthyPDF.py

That should do the trick as long as ocrmypdf / pikepdf did not introduce any changes to their api