Improve the README.md

Added
* What the script does (including what info is asked)
* How to download the script
* Change the structure a bit
3 jobs for 16-documentation-improvement
Status Name Job ID Coverage
  Build
failed build #545

 
  Test
skipped code_quality #547
allowed to fail
skipped test #546
 
Name Stage Failure
failed
build Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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