title: set input or output context dialogflow nodejs v2
body: <p>I am using <code>dialogflow</code> NPM module and I want to send <code>input/output context</code> but I am not sure how to do.
  I know I can do in <code>google-assistant</code> NPM with
  I can set <code>contexts</code> with <code>parameter</code> using below method,</p>
  
  <pre><code> const parameters = { // Custom parameters to pass with context
       welcome: true,
   };
   conv.contexts.set('welcome-context', 5, parameters);
  </code></pre>