Add mu plugin for vip

[PatelUtkarsh]

• https://github.com/rtCamp/wordpress-skeleton/blob/9a7705e279e368c53cb0dd95f4f476f80e2ed72c/.circleci/install_mu_plugins.sh
• https://github.com/rtCamp/wordpress-skeleton/blob/9a7705e279e368c53cb0dd95f4f476f80e2ed72c/.circleci/config.yml#L79