Add section to README describing GOPATH and direnv
Add section to README describing GOPATH and direnv

[#86333620]

CloudCredo/cf-mysql-release,cloudfoundry/cf-mysql-release,CloudCredo/cf-mysql-release,cloudfoundry/cf-mysql-release,kbastani/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,krishna-mk/cf-mysql-release,krishna-mk/cf-mysql-release,kbastani/cf-mysql-release,CloudCredo/cf-mysql-release,krishna-mk/cf-mysql-release,kbastani/cf-mysql-release