Catch README file not found error

[sadick254]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

• Use a fs.statSync to check if the file is available before calling fs.readFileSync

See atom/atom#22109

Alternate Designs

• Add a try catch block around fs.readFileSync because the call to fs.readFileSync could throw an error in the event a file is not available.

try {
  readme = fs.readFileSync(this.readmePath, {encoding: 'utf8'})
} catch(err) {
  readme = null
}

Benefits

Improved user experience. We should not be throwing an error if the README file is not available, we should fail safely.

Possible Drawbacks

N/A

Applicable Issues

atom/atom#22109