Add How to better configure your cache document

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[codecov]

Codecov Report

Merging #450 (298760e) into dev (c663379) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #450      +/-   ##
==========================================
- Coverage   93.87%   93.82%   -0.06%     
==========================================
  Files          90       90              
  Lines        3332     3335       +3     
==========================================
+ Hits         3128     3129       +1     
- Misses        204      206       +2     

Impacted Files	Coverage Δ
gptcache/adapter/adapter.py	85.85% <100.00%> (-0.81%)	⬇️
gptcache/manager/vector_data/manager.py	98.85% <100.00%> (ø)
...ptcache/processor/context/summarization_context.py	98.41% <100.00%> (ø)

... and 2 files with indirect coverage changes