As a implementer, I want to pass encrypted password and the jar should decrypt the password and use it to connect to EIC

[vivek9237]

1. Need support for symmetric encryption.
2. The SDK should help implementers generate encrypted passwords.
3. Implementers need not pass the credentials every time they need to use the SDK. The SDK should be able to read credentials and other required information from a property file.
4. If a property file is not mentioned while instantiating the EicClient object, then a default value of the property file should be taken.