Fix and improve guide start in readme

[NicolasMahe]

No description provided.

[antho1404]

I'm ok to have some verbosity but this is a quick start and should be quick, not perfect, I would remove the handling of errors here, on the document we need it, on the quick start not really we don't want to show a huge code that they might be afraid of.

I feel this code is 3 times bigger, that's not attracting

[NicolasMahe]

I'm ok to have some verbosity but this is a quick start and should be quick, not perfect, I would remove the handling of errors here, on the document we need it, on the quick start not really we don't want to show a huge code that they might be afraid of.

I feel this code is 3 times bigger, that's not attracting

It's bigger not because of error handling but because of code style.

The only error added is on the return of the executeTaskAndWaitResult func:

      if (result.outputKey !== 'success') {
        const message = JSON.parse(result.outputData).message
        console.error('an error occurred while sending the invitation: ', message)
        return
      }

I think most developer don't check much the actual documentation, so having verbosity here will help them to understand what's going on.