Add comments

index.js

@@ -2,10 +2,12 @@ const core = require('@actions/core');
 const github = require('@actions/github');
 
 try {
+  // `who-to-greet` input defined in action metadata file
   const nameToGreet = core.getInput('who-to-greet');
   console.log(`Hello ${nameToGreet}!`);
   const time = (new Date()).toTimeString();
   core.setOutput("time", time);
+  // Get the JSON webhook payload for the event that triggered the workflow
   const payload = JSON.stringify(github.context.payload, undefined, 2)
   console.log(`The event payload: ${payload}`);
 } catch (error) {