Update Readme for demo app setup steps

[cacheung]

Update Readme for demo app setup steps

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #60 (01c7170) into feature/adIdConsent (119b32c) will not change coverage.
The diff coverage is n/a.

❗ Current head 01c7170 differs from pull request most recent head ad997b2. Consider uploading reports for the commit ad997b2 to get more accurate results

@@                 Coverage Diff                  @@
##           feature/adIdConsent      #60   +/-   ##
====================================================
  Coverage                81.02%   81.02%           
====================================================
  Files                       19       19           
  Lines                      922      922           
  Branches                   140      140           
====================================================
  Hits                       747      747           
  Misses                     123      123           
  Partials                    52       52           

Flag	Coverage Δ
functional-tests	61.06% <ø> (-0.11%)	⬇️
unit-tests	79.06% <ø> (ø)

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[emdobrin]

Looks great with a small fix for links