update README

README.md

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 # RamanD2O
 
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@@ -14,6 +14,7 @@ RamanD2O is an R Shiny application that allows biologists to perform Raman spect
 ## Quick start
 
 1. Download and Install R
+
 https://www.r-project.org
 
 **Notes:** This app was tested in **R versions 4.2 and 4.3**.