Add alphabetization requirements to README
Add alphabetization requirements to README

[finish #150067807]

kkellner/cli-plugin-repo,cloudfoundry-incubator/cli-plugin-repo,kkellner/cli-plugin-repo,guidowb/cli-plugin-repo,cloudfoundry-incubator/cli-plugin-repo,guidowb/cli-plugin-repo,guidowb/cli-plugin-repo,cloudfoundry-incubator/cli-plugin-repo,cloudfoundry-incubator/cli-plugin-repo,kkellner/cli-plugin-repo,guidowb/cli-plugin-repo