readme update

README.md

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 Severus is a somatic structural variation (SV) caller for long reads (both PacBio and ONT). It is designed for matching tumor/normal analysis,
 supports multiple tumor samples, and produces accurate and complete somatic and germline calls. Severus takes
 advantage of long-read phasing and uses the breakpoint graph framework to model complex chromosomal rearrangements.
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+If you use Severus, please cite https://www.medrxiv.org/content/10.1101/2024.03.22.24304756v1
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 ## Benchmarking Severus and other SV callers
 
+For the details of benchmarking and complete results, please check https://www.medrxiv.org/content/10.1101/2024.03.22.24304756v1
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 ### Germline benchmarking results using HG002
 
 First, we verified performance of Severus on a germline SV benchmark.