_examples: context

[mcuadros]

This is an example that illustrates how to do a graceful shutdown of a clone operation.

[codecov]

Codecov Report

Merging #555 into master will decrease coverage by 0.6%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #555      +/-   ##
=========================================
- Coverage    78.1%   77.5%   -0.61%     
=========================================
  Files         129     129              
  Lines        9807    9807              
=========================================
- Hits         7660    7601      -59     
- Misses       1316    1388      +72     
+ Partials      831     818      -13

Impacted Files	Coverage Δ
plumbing/transport/ssh/common.go	20.54% <0%> (-45.21%)	⬇️
plumbing/transport/ssh/auth_method.go	31.57% <0%> (-22.81%)	⬇️

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[orirawlings]

Looks good. We should add a link in the _examples/README.md.