go install github.com/jpoles1/gopherbadger@master to install tooling for generating code coverage badge for readme.
Set ![gopherbadger-tag-do-not-edit]() in the readme, and then this gets replaced with a code coverage percentage badge.
Generate the required code coverage reports using: go test -coverprofile cover.out followed by go tool cover -html=cover.out -o coverage.html for a visual report.