Update README how to avoid an out-of-memory error

[evshary]

Related to https://github.com/eclipse-zenoh/zenoh/issues/1782

This issue is also reported by users on Raspberry Pi, which has insufficient memory. I think it's worth providing information on the README.

[github-actions[bot]]

PR missing one of the required labels: {'enhancement', 'dependencies', 'documentation', 'breaking-change', 'internal', 'new feature', 'bug'}

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.94%. Comparing base (e8663bd) to head (4ebf9fb). Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1993      +/-   ##
==========================================
+ Coverage   70.88%   70.94%   +0.05%     
==========================================
  Files         365      365              
  Lines       61666    61666              
==========================================
+ Hits        43713    43749      +36     
+ Misses      17953    17917      -36     

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