Update README.md

update description.

README.md

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 # ansible-telnet
-customize Ansible telnet module by my purpose
+
+By default, Ansible module will retrieve username/password value from playbook file: telnet block.
+Since the fields are supported by inventory already, and the part also was highlight, I custome it and test it.
+
+Back your file and update it to /site-packages/ansible/plugins/action/telnet.py
+
+Note:
+the setting: 
+connection: local 
+in playbook will cause ansible use you local user.