Update Readme.md

Cas13designGuidePredictor/Readme.md

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 cd Cas13design
 cat Install.txt
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 ## Example
 
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 ```
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 ### Predict guide RNA scores
 
 Next, simply execute RfxCas13d_GuideScoring.R by providing 3 required input arguments:
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 Once Cas13design is fully installed, the run time scales with the fasta input length.
 Our software extracts all information needed from the target input sequence, including base probabilities, RNA-RNA hybridization energies, RNA target site accessibility or guide RNA folding.
 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
 
 The output may be 3-fold and named after the fasta header information: