Add report file path

This update lets users specify a path to the coverage report file

with:
  file: ./coverage.xml

Linting, spelling fixes

Just a few quick spelling fixes across a couple files

Patch public repo uploads

Bug fix: Public repositories should be able to upload without a token. Prior to this patch, a token would've been required to upload for all public repos using the Codecov action

Initial release

Capabilities:

• Invoke Codecov's bash uploader
• Use token to validate upload