feat: set working directory

[umar-muneer]

• Read Config from a provided working directory
• Write Record to a provided working directory
• A new option has been added to the cli --working-dir
• files are provided to the cli the same way as before.

Todo:

• update readme

[codecov]

Codecov Report

Merging #77 into master will decrease coverage by 0.2%.
The diff coverage is 99%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   98.31%   98.11%   -0.21%     
==========================================
  Files          11       12       +1     
  Lines         357      372      +15     
  Branches       47       51       +4     
==========================================
+ Hits          351      365      +14     
- Misses          6        7       +1

Impacted Files	Coverage Δ
lib/config.js	100% <100%> (ø)	⬆️
__tests__/config/fixtures/.esplintrc.js	100% <100%> (ø)
lib/cli.js	94.02% <100%> (ø)	⬆️
lib/record.js	100% <100%> (ø)	⬆️
lib/engine.js	98.8% <98.8%> (-1.2%)	⬇️

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