Add docs for API version below 24

[niallzato]

Adding to our docs how to create the JSON object for implementations supporting a minimum API version below 24.

[codecov-commenter]

Codecov Report

Merging #84 (a7f1d5c) into main (6c96588) will decrease coverage by 32.67%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##               main      #84       +/-   ##
=============================================
- Coverage     78.16%   45.49%   -32.68%     
+ Complexity      442       14      -428     
=============================================
  Files            64        8       -56     
  Lines          5478      855     -4623     
  Branches        691       85      -606     
=============================================
- Hits           4282      389     -3893     
+ Misses          650      436      -214     
+ Partials        546       30      -516     

Impacted Files	Coverage Δ
...gment/analytics/kotlin/core/utilities/FileUtils.kt
...va/com/segment/analytics/kotlin/core/HTTPClient.kt
...segment/analytics/kotlin/core/platform/Timeline.kt
...m/segment/analytics/kotlin/core/platform/Plugin.kt
...ytics/kotlin/core/platform/plugins/StartupQueue.kt
...om/segment/analytics/kotlin/core/AnalyticsTests.kt
...lin/com/segment/analytics/kotlin/core/StateTest.kt
...n/core/utilities/EventManipulationFunctionsTest.kt
...ics/kotlin/core/platform/DestinationPluginTests.kt
...m/segment/analytics/kotlin/core/HTTPClientTests.kt
... and 46 more

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[wenxi-zeng]

LGTM