docs: add snippets for getting started guide

[olavloite]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.86%. Comparing base (6ef7240) to head (28112a8).
Report is 1034 commits behind head on postgresql-dialect.

❗ Current head 28112a8 differs from pull request most recent head 550efa4

Please upload reports for the commit 550efa4 to get more accurate results.

Additional details and impacted files

@@                   Coverage Diff                    @@
##             postgresql-dialect    #1600      +/-   ##
========================================================
+ Coverage                 86.32%   90.86%   +4.53%     
- Complexity                 1914     2704     +790     
========================================================
  Files                       122      144      +22     
  Lines                      6216     9257    +3041     
  Branches                    849     1345     +496     
========================================================
+ Hits                       5366     8411    +3045     
+ Misses                      605      568      -37     
- Partials                    245      278      +33     

Flag	Coverage Δ
all_tests	90.86% <ø> (+4.53%)	⬆️

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