Fix docs on integrating sccache with MSVC when cmake >= 3.25

[johnwbyrd]

Documentation was incomplete, in the situation where sccache is compiling a cmake project with MSVC, only if the version of cmake is equal to or greater than 3.25. The CMP0141 is required in order to get the new behavior with CMAKE_MSVC_DEBUG_INFORMATION_FORMAT. I rewrote the readme to not assume the older version of cmake.

[Xuanwo]

cc @sylvestre for a review.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d1696b) 30.87% compared to head (42c929a) 31.08%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2031      +/-   ##
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+ Coverage   30.87%   31.08%   +0.21%     
==========================================
  Files          51       51              
  Lines       19624    19585      -39     
  Branches     9420     9410      -10     
==========================================
+ Hits         6058     6088      +30     
+ Misses       7876     7836      -40     
+ Partials     5690     5661      -29     

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[johnwbyrd]

Thanks for fixing it.

[sylvestre]

happy to help :)