ReadMe: testing SDK

[kohearn-vail]

Update Example used to test that SDK is properly setup:

import com.vailsys.persephony.api.PersyClient;
import com.vailsys.persephony.api.PersyException;

public class Example {
    // your Persephony account ID
    public static final String accountId = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
    // your Persephony authentication token
    public static final String authToken = "your_auth_token";
    // phone number receiving test SMS in format "+1XXXXXXXXXX"
    public static final String To = "your_phone_number";
    // Persephony phone number in your account associated with sending the test SMS in format "+1XXXXXXXXXX"
    public static final String From = "a_persephony_phone_number_in_your_account";

    public static void main(String[] args) {
        try {
            PersyClient client = new PersyClient(accountId, authToken);
            client.messages.create(From, To, "Welcome to Persephony!");
        }
        catch(PersyException pe) {
            System.out.println(pe.getMessage());
        }
    }
}