Provide sample js script and command line input for ChakraCoreHost sample

[haichencheng]

When I am trying to run the ChakraCoreHost sample project, the instruction
5. Run the sample by pressing Ctrl+F5 or using Debug > Start Without Debugging.
is not correct.

After I stepped through the code, I got that I supposed to provide a path to a js file such as
C:\Users\XXX\Desktop\temp\runSimple.js

to exercise the host's function, I create runSimple.js with content:
host.runScript('C:/Users/XXX/Desktop/temp/simple.js');

Where simple.js has content:
host.echo("wbc",1,2,3);

[liminzhu]

@haichencheng are you talking about this one? Right you need to supply the script and the path as argument and that isn't clear from the readme. Let me fix this.

[misuo]

I believe the below simple javascript (a nameless function call) - when saved to a test.js file - illustrates how it works:

( () => {
  host.echo('Hello World!');
  // host.argument[0] is the .js file.
  host.echo("Hello " + host.arguments[1]);

  return 0;
} )();

In a command prompt run the test.js script with (here illustrated using the Windows version):

ChakraCoreHost.exe test.js "YourName"

And you should/will see the output:

Hello World!
Hello YourName
0

[liminzhu]

Sorry for the late update. Added some clarification in readme to make it obvious. 42d4bfc