fix: Fix code in README USAGE section

[aaelony]

The USAGE section in the existing README.md didn't compile. Why? Because the settings code needs to be in a function scope, e.g. main. A simple fix ;)

This PR provides that simple fix, allowing causal users to find working code in the USAGE section.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.09%. Comparing base (394c629) to head (e2e9304).
⚠️ Report is 78 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (394c629) and HEAD (e2e9304). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (394c629)	HEAD (e2e9304)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #40       +/-   ##
===========================================
- Coverage   83.77%   61.09%   -22.68%     
===========================================
  Files           8       27       +19     
  Lines        1923     6429     +4506     
===========================================
+ Hits         1611     3928     +2317     
- Misses        312     2501     +2189     

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