(Improvement) Update README file

[garatortiz]

• What is it? (leave one option)

  • (Improvement) of existing functionality

• What was the root cause of the problem originally / what feature was missing? It was not clear from where get all the keys to run the app locally and from where get the confirmation code for test the Verify Code section

• How does this pull request solve it (in broad terms)? Updates the Readme file with Lob.com information and a better explanation of the response json data.

• Does it close any open issues? Closes #75

• Quick checklist

  • [X] eslint shows no errors

    cd web-dapp
    eslint .

  • [X] docs were updated where necessary OR they don't need to be updated
  • [X] tests were updated where necessary OR they don't need to be updated

• Additional information

[coveralls]

Pull Request Test Coverage Report for Build 169

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 57.755%

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Totals
Change from base Build 167:	0.0%
Covered Lines:	630
Relevant Lines:	1077

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💛 - Coveralls