Changing copy based on yarn.lock

[gagoar]

When adding the copy on the generated content, we check if yarn.lock is present so we can recommend the right command to run.

I've also excluded node_modules as a default to avoid going through all the node_modules files.

[codecov]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #3   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          188       194    +6     
  Branches        27        29    +2     
=========================================
+ Hits           188       194    +6     

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/commands/generate.ts	100.00% <100.00%> (ø)
src/utils/constants.ts	100.00% <100.00%> (ø)
src/utils/getGlobalOptions.ts	100.00% <100.00%> (ø)

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