Update Readme.md

Cas13designGuidePredictor/Readme.md

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 The minimum length supplied must be at least 30 nucleotides. The total run time for the provided ~1000nt test.fa example is about 2 min.
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 ### Output
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 ![alt text](./data/ExampleS.png "USA/NY1-PV08001/2020 S gene")
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