Update getting started doc

[cacheung]

Update getting started doc.

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 #33 (3e71e94) into dev (aba5550) will decrease coverage by 0.46%.
The diff coverage is 49.23%.

@@             Coverage Diff              @@
##                dev      #33      +/-   ##
============================================
- Coverage     79.38%   78.92%   -0.46%     
+ Complexity      287      286       -1     
============================================
  Files            15       15              
  Lines          1494     1514      +20     
  Branches        183      184       +1     
============================================
+ Hits           1186     1195       +9     
- Misses          213      222       +9     
- Partials         95       97       +2     

Flag	Coverage Δ
unit-functional-tests	78.92% <49.23%> (-0.46%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ng/mobile/analytics/internal/AnalyticsConstants.kt	100.00% <ø> (ø)
...ng/mobile/analytics/internal/AnalyticsExtension.kt	68.60% <32.60%> (-1.18%)	⬇️
...ing/mobile/analytics/internal/AnalyticsDatabase.kt	93.61% <50.00%> (ø)
...mobile/analytics/internal/AnalyticsHitProcessor.kt	93.02% <92.85%> (+0.28%)	⬆️
...arketing/mobile/analytics/internal/AnalyticsHit.kt	89.47% <100.00%> (ø)
...keting/mobile/analytics/internal/AnalyticsState.kt	70.18% <100.00%> (ø)

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