Feature/cli support

[linw1995]

• 9c3b5d7 New:Add Command-line interface support
• cd57416 Merge branch 'master' into feature/cli_support
• 4014919 New:Add section of "Usage via CLI" into docs

[codecov]

Codecov Report

Merging #8 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   99.79%   99.80%   +0.01%     
==========================================
  Files           3        4       +1     
  Lines         492      521      +29     
  Branches       59       61       +2     
==========================================
+ Hits          491      520      +29     
  Partials        1        1              

Impacted Files	Coverage Δ
jsonpath/cli.py	100.00% <100.00%> (ø)

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