Brief Summary of Changes

The sample app was using deprecated packages.

1. Recreated the sample app using latest Create React App.
2. Updated the upload widget code to fit it's current api.
3. Removed unneeded dependencies
4. Simplified scripts
5. Updated README.md

What does this PR address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all of the tests pass.