Command: ios keychain add

Usage: ios keychain add --account <account> --service <service> --data <entry data>

Adds a new entry to the iOS keychain using SecItemAdd.

The new keychain entry class would be kSecClassGenericPassword with no extra 
kSecAttrAccessControl set.

Examples:
   ios keychain add --account token --data 1122-33344-55122-55512
   ios keychain add --service foo --data bar
