Added README to cf-mysql-release
Added README to cf-mysql-release

[Finishes #62361342]

Signed-off-by: Ryan Tang <cec15a19ffa0a7849e90782f9010f3edd6d14e92@pivotallabs.com>

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