Clarify Readme with Docker use case

[toenuff]

[codecov-io]

Codecov Report

Merging #31 into master will not change coverage. The diff coverage is 86.23%.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   86.15%   86.15%           
=======================================
  Files          40       40           
  Lines        2420     2420           
=======================================
  Hits         2085     2085           
  Misses        335      335

Impacted Files	Coverage Δ
lib/winss/environment.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/map_value_iterator.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/case_ignore.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/supervise/state_file.cpp	88.75% <ø> (ø)	:arrow_up:
lib/winss/filesystem_interface.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/windows_interface.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/pipe_name.hpp	100% <ø> (ø)	:arrow_up:
lib/winss/windows_interface.cpp	47.82% <ø> (ø)	:arrow_up:
lib/winss/ctrl_handler.cpp	100% <ø> (ø)	:arrow_up:
lib/winss/control.cpp	99.13% <100%> (ø)	:arrow_up:
... and 61 more

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