Atualizando o arquivo README.md

README.md

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 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/cfbastarz/GSIBerror/main)
 
-Uma classe para ler e plotar os records da matriz B do GSI.
+The `GSIBerror` is a Python class to read the records and attributes from the background error covariance matrices compatible with the Gridpoint Statistical Interpolation (in the `.gcv` file format). Currently, the package is capable of reading only the global version of the matrix.
 
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