Update README.rst

Author: sneharai4

README.rst

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 HPE Alletra 9000 and HPE Primera and HPE 3PAR REST Client
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 This is a Client library that can talk to the HPE Alletra 9000 and Primera and 3PAR Storage array.
 The HPE Alletra 9000 and Primera and 3PAR storage array has a REST web service interface and a 
 command line interface. This client library implements a simple interface for talking