Update README.md

README.md

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-SANDY is a python package that can read, write and perform a set of operations on nuclear data file in 
+SANDY is a python package that can read, write and perform a set of operations on nuclear data files in 
 [ENDF-6 format](https://www.oecd-nea.org/dbdata/data/manual-endf/endf102.pdf).
-The primay objective of the code, as it was originally conceived, is to produce *perturbed files* containing sampled parameters 
+The primary objective of the code, as it was originally conceived, is to produce *perturbed files* containing sampled parameters 
 that represent the information stored in the evaluated nuclear data covariances.
 Such files can be ultimately used to propagate uncertainties through any given compatible system using a brute force technique.