added paper draft URL to README.txt

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 Strong simulation of multi-Pauli measurements using minimal stabilizer state decompositions
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+See the draft at [https://arxiv.org/abs/2012.11739] for an introduction and description of this code.
+
 PREREQUISITES:
 
 You will need the Lapacke library to run strongsim[1-12]_rellerr.c (in particular, the lapacke.h header).