Updating Hello World Example with README and try/except

[chrisalexiuk-nvidia]

Description

Updates the Hello World notebook, and outlines recommended courses of action for common errors.

Additionally provides an overview in the README.md.

Checklist

• [x] I am familiar with the Contributing Guide.
• [x] New or Existing tests cover these changes.
• [x] The documentation is up to date with these changes.

[ryantwolf]

@chrisalexiuk-nvidia Looks like the precommit check is failing, make sure your README is formatted properly

[chrisalexiuk-nvidia]

Updated, sorry!