update readme for cli to demonstrate typical use of --poll argument

[ajzobro]

Description

Minor change to the README.md to provide an example of using --poll right from the start as is likely the most often uses use-case.

Resolved issues

Added an example, see above.

Documentation

Documentation change only.

Web service API changes

Documentation change only.

Tests

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.93%. Comparing base (1e218e8) to head (a8959e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #845   +/-   ##
=======================================
  Coverage   70.93%   70.93%           
=======================================
  Files         108      108           
  Lines        9566     9566           
  Branches      854      854           
=======================================
  Hits         6786     6786           
  Misses       2609     2609           
  Partials      171      171           

Flag	Coverage Δ		*Carryforward flag
agent	72.41% <ø> (ø)		Carriedforward from 7299763
cli	87.78% <ø> (ø)
device	54.22% <ø> (ø)		Carriedforward from 7299763
server	87.71% <ø> (ø)		Carriedforward from 7299763

*This pull request uses carry forward flags. Click here to find out more.

Components	Coverage Δ
Agent	72.41% <ø> (ø)
CLI	87.78% <ø> (ø)
Common	∅ <ø> (∅)
Device Connectors	54.22% <ø> (ø)
Server	87.71% <ø> (ø)

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[rene-oromtz]

Thanks for helping to improve the CLI README! I added a comment for rendering properly in markdown and a suggestion on this note placement