Update README.md

README.md

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-# cryptocli
+# cryptocli
+
+cryptocli is a command line tool to manage, control and access KeyControl Tokenization Vault. 
+
+The KeyControl Tokenization Vault provides centralized mechanism to create and manage cryptographic keys and utilize those keys to encrypt, decrypt, tokenize, detokenize, sign, verify, wrap and unwrap data. 
+
+cryptocli requires Entrust KeyControl version 10.2 or later. 
+
+A Tokenization Vault must be created by the KeyControl Security Administrator. 
+
+Both Tokenization Vault Users and Administrators can access secrets using the cryptocli with the login URL. 
+
+Access to certain commands can be restricted using tokenization permissions from access policies.
+
+For more information, see the Tokenization Vault chapter in the KeyControl documentation