Add WordPress-VIP-Go coding standard for PHPCS

[westonruter]

Fixes #471

[codecov-commenter]

Codecov Report

Merging #476 (3c8d362) into develop (a7c41d4) will not change coverage.
The diff coverage is 18.18%.

❗ Current head 3c8d362 differs from pull request most recent head 9de5c7e. Consider uploading reports for the commit 9de5c7e to get more accurate results

@@            Coverage Diff             @@
##             develop     #476   +/-   ##
==========================================
  Coverage      23.26%   23.26%           
  Complexity       364      364           
==========================================
  Files             56       56           
  Lines           1947     1947           
==========================================
  Hits             453      453           
  Misses          1494     1494           

Flag	Coverage Δ	Complexity Δ
php	23.26% <18.18%> (ø)	364.00 <0.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...p-service-worker-custom-background-integration.php	0.00% <0.00%> (ø)	5.00 <0.00> (ø)
...ss-wp-service-worker-custom-header-integration.php	0.00% <0.00%> (ø)	16.00 <0.00> (ø)
pwa.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
wp-includes/class-wp.php	14.28% <0.00%> (ø)	0.00 <0.00> (ø)
...wp-service-worker-navigation-routing-component.php	1.48% <0.00%> (ø)	34.00 <0.00> (ø)
wp-includes/template.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
wp-includes/class-wp-https-ui.php	83.15% <100.00%> (ø)	37.00 <0.00> (ø)
wp-includes/class-wp-service-workers.php	76.92% <100.00%> (ø)	11.00 <0.00> (ø)

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