Github Action : WPCS Linting

[AnirudhAP2k]

Targets #47

Description

• Added WPCS workflow file to enable CI checks.
• The CI will follow the Wordpress-php coding standards.
• Also added WPCS.md file as the configuration guide.

Sanity Checks

• [x] Hygiene
  • [x] Code self-review
  • [x] Variables & functions have been named properly and signify their meaning
  • [x] Code is properly formatted
  • [x] No code duplication
  • [x] Removed all debugging code like var_dump
• [x] Pull Request (PR)
  • [x] Properly summarized all the code changes in the PR description
  • [x] Have explicitly followed design file
  • [x] Have assigned me as the PR assignee
  • [x] Have added correct labels to the PR before requesting for review
• [x] Testing
  • [x] Tested locally